Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3a4afd18e0de1b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 06:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56b53a819a778e0de34e2d4d8a0b3fe8 SHA-1: a1a8ae13fd8cb0d8c95479fb8739f11b5845d92b SHA-256: 1d3a4afd18e0de1b89fa4bc222f9f54d5dcc315d59ac57344d534b75786a4e35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. No scripts were extracted, but the structure and URL analysis point towards a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.letnifestiwal.pl/ckfinder/userfiles/files/20443347622.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0ke6a1jn6sdkt4si59tr4iplo4/45779400767.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/malexilez.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/97867822382.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/10467142708.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/3449104636.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612feacf1553b.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/50221264980.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161307409cc3dc---dofubuvaxedi.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/kixojakerotategazir.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1696a17b2---lafumopajibebarujaxifi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sebegusufigovemilironazo.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/35155545496.pdfIn PDF document text
    • https://thehouseproduction.net/file/93725244317.pdfIn PDF document text
    • http://simoncaulkin.com/images/sozikutewoga.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/zewujexedure.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109100615236604.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/mudis.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jufaw.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/99812828875.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfc117716---16318008228.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/misezokizunatelazopopo.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/22209402711.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109180346531177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+screen+mirror+android+to+windows+7PDF link annotation
    • 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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 17652 bytes
SHA-256: f9d75243048a06700fa4afdc60d486b288e6ee55acbbac5be8fc475bc78ea9cb
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10612 bytes
SHA-256: 7264e427652beb2d6e55cfcf40a12c32c90b42040bcce314657b850cd4c00e77