Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd60b44df71b0f19…

MALICIOUS

PDF

115.9 KB Created: 2021-06-26 11:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c73aaee3b249f51a005e4a1a07cc19 SHA-1: 38d7b7be249f0036278f0564ab2ba19615953d98 SHA-256: bd60b44df71b0f19a2ef2c6b4c4114664885bffe0fc2c9332da9322d42e7490c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://akproauto.com/nbloom/fckuploads/file/99646455787.pdf
    • http://netpost.vn/upload/userfiles/files/20815609123.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6acf9a29798deba5f8ec14a14484dc10/jusibetew.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae203275c---12279390547.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e275f045dd---31271203535.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/93eeecd50d5272978aa23090cc35aaad/12817523567.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/bd2c4125a52d9fa278caba2fd69ce7ed/1447390938.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d550edda---viluwefutemakelizibew.pdf
    • https://observatoire-omic.org/documents/file/85469347370.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1508352f8996ff220f1799d017ac5aa4/bebunowaben.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa530bce1---94401354878.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ba12926f---32580214060.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc0f3816f---nububom.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2f16dbf5---jexewojiravizenome.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a33223f165c62063cf75a76dbaf1fb13/rijugonafek.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/h906l3mnur3qj2hjbrt329k6if/29032259604.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf345201f---46032013150.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f0a8cf92---79332947744.pdf
    • https://meganimal.pt/site/upload/file/10659015768.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/k5r0upfsjr1mfjlkirettj3nff/52743029236.pdf
    • https://watertorens.nl/userfiles/file/72842996243.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c875d1fcb2---42926645445.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e71cf054---30251324716.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+unblocked+download+weebly
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013eb9.bin
9901cfeb333129b2fe2168efd144ff59c0578c2c98b529e279adae8214e76c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB9 20568 bytes
font_01_sfnt_off0001722d.bin
64bc430d76381f273bcedeaa48f18770a29bae68c4df3bb33cda2723c3a3afe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1722D 9236 bytes
font_02_sfnt_off000190a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190A3 16792 bytes
font_03_sfnt_off0001a8ba.bin
9507cd3f36c474b39abe9b021cce7c5d142974e60d8738da3937afa034a0ccf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8BA 10824 bytes

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