Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1980a613bff164…

MALICIOUS

PDF

86.9 KB Created: 2021-10-04 23:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05b29bc7a666ff0213861aba3b1b344b SHA-1: 055376e661b8fa39492671f1c8e0f11db2f47a93 SHA-256: ad1980a613bff16402324a3591da3db1407159e06aad732520f86a3d452426d3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including one identified as a compromised CMS upload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous external URIs and a link farm structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gabinetortodontyczny.eu/userfiles/file/44129942873.pdf In PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/rofigekafebi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6c4f90a72c2a5faa50ae2dece918bd74/bunitijidobunokal.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/nukulo.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sanejovinolos.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/xuxulosuxaxuzirefexojeg.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/8122661546.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/4371547109.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/79713476285.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/lilezalefano.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/75495531889.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/japajoso.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/97284119788.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16131971781de7---napusanejilufifisoxu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911121851363029.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/fusebefilakirowi.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/noxexuxixaratikamuleg.pdfIn PDF document text
    • https://pcetravel.com/files/file/garigadijide.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/65197537228.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/88772093770.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16159317f3ecbc---zolaluw.pdfIn PDF document text
    • http://davobio.com/upload/files/33799094298.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/movimadane.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/bonurebirolupilixilev.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/dbe0ef40467960f8c1976debb9178f5e/xuxegonesimevofato.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/kapiredoriwovozudajadel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=carlson%27s+guide+to+landscape+painting+pdfPDF 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_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 17728 bytes
SHA-256: ba31a1382a24d1367f651bafd40f21e9e73c1bca6d47d054cbaf662f4eb9157f
font_01_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 10960 bytes
SHA-256: f34107c9a3f9b4f4ed12a60eb2fd9b2f3271e9d85678c411fb80bbba36cc7f4a