Malicious PDF — malware analysis report

Static analysis result for SHA-256 adddc4845b1de384…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 18:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2813f9f8750574b0d7ba07b5c01f7f3 SHA-1: 37c5a5260ea00e66a5b3877dbdf10147afbf329b SHA-256: adddc4845b1de3844879190d7a791d905be0011d4ad59685e90c7b844f20f4cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution campaign, indicated by numerous external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the embedded URLs likely serve as lures to download malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=unknown+tribes+in+the+world PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160905dc1d5aaf---31401494098.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/38918363556.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a902b5ab2a38bff71e9dbcc69a14d576/popibiwipojobepubuseta.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c2581c602---41353106916.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//96658384745.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48f2460bf---vipuwivupiselem.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/vexufexukegeme.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8df05678885c91c0fcfc4bf8c241b8bd/luzuxorebini.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7908bbce5658958f5e68f988c5ca5cb/31459313902.pdfIn PDF document text
    • https://spacio.hk/attachment/file/51963544908.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xajatofanokeka.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6c1ff1e05f405d7c9b283bcf4465da0e/wizuvapawuzixikejisija.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5fb4a92f2cae22d6462c17eb3d02fef4/19333015739.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/xixediniluroxobulozabaku.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/soluz.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c97c62fbb---mizewe.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea57b3d5f---jegewito.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd8bf1666---99981134758.pdfIn PDF document text
    • https://ive-cal.it/file/38130879424.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af8bf7ac8b94fdb412d2da36e94dd5fb/gukudoxirenemafe.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6504196a1a53863adedbc57ce49a550d/jonafogovokosuxaxel.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753f6a853c---72168463667.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f7b8463---46529920340.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/jisapiladusajowexebumulow.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/webalupibogabepoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef6e55b75---34836677011.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 10508 bytes
SHA-256: cfc812c4fc42c8fc80fe35c55246acdc14f5f5897f8c2a212aea936dcd0a4d82
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 18880 bytes
SHA-256: 935e77806cd78b12c21e76b42704ff46eedaf829597eae3bf50500ebd7f17767

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