Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2dd3e43cb833b6…

MALICIOUS

PDF

144.6 KB Created: 2021-07-20 18:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7870d0c5ca529d17976809e7d040e42 SHA-1: b2e4915c435c2362cd352edddc7d382c57c972b2 SHA-256: be2dd3e43cb833b6a9c43781ded1f19ceb237671369e42f5ea68508e58f8095d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. Heuristics indicate the PDF is designed as a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1f4d3c3196840ec3cb13e377e40cb1fb/nopikanotonolomin.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/344733a3fc87735f233ad9a723ca001f/16072407504.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073879919b4c---rejububokuwukife.pdf
    • http://samsung-service-center.ru/uploads/files/tivusetove.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990fe9b9b0b---zuvalenofolezazaba.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105151024174392.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802bfff182a---junonemi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772df3b3c8---40905070226.pdf
    • http://ytbozhuo.com/upload/file/230536129464.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4cd1226ad38ee4c33bf7bcfa0514e975/raname.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f3cd3acef---32923508509.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dc00cdb8a41255d7147d93b07266d9a6/84527792364.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794faac6605---jexowiwifowosuwosuk.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fmfte90cvqiojneaigi8ped811/87504249112.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5337988581.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db0dfcbe8c7bc9ac061fd1b4f97559d4/salovixig.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/lukededegosasiwobuzumu.pdf
    • http://antifftech.com/uploadfile/file///2021060216071794.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/145djcsfe2bq4quusph41urcvd/sagobazepipexipezofofaji.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e018d1d6dbd16494a456ce6cd9b82a2b/wejadepoxisuzofu.pdf
    • https://saam.vn/images/content/file/tavuwimejofegidozunemi.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/geimkvg4cc0vdvdmvbmuproikc/nolesomivizagusite.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163d296d15---47398445914.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=spiritual+words+starting+with+m
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001bd38.bin
d4b8dcebe09e348105ba37739f7f6716f2b1c1e24f5e8fafd83698ac55729d81		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BD38 17244 bytes
font_00_sfnt_off0001a527.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A527 16792 bytes
font_02_sfnt_off0001d735.bin
5431ea56b1919398d6758ac86f22bcdda0454bc2aecf75434ae97cfc55236cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D735 10968 bytes
font_03_sfnt_off0001f036.bin
65548bdd9294456ff6bd92662a6e9092a0bdb974d0a24287eec5ddd5fc5119e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F036 2936 bytes
font_04_sfnt_off0001fc52.bin
856c6ec01bd601b54d3605c46af28e57773b9c7a6db4aa6824528c330c2a1c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC52 22872 bytes

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