Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6b7f17b207a99d…

MALICIOUS

PDF

87.1 KB Created: 2021-08-20 15:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa5e608b008b6d6d03767dae2a933d89 SHA-1: bae20c7c4822dfec4223963f76f0edfc9f828280 SHA-256: 8f6b7f17b207a99dfe0661d5647f44883a53476ee001e10f60546a8f8868819c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple unknown reputation URLs further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16902974272.pdf
    • https://stef-nancy.fr/upload/document/26653147338.pdf
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/13641891415.pdf
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/xukuvoses.pdf
    • http://k-souz.com/userfiles/file/damulozek.pdf
    • http://badaranquehablar.com/userfiles/files/31626355770.pdf
    • http://prvugkh.ru/uploads/files/gejetenepomumojedorutipa.pdf
    • https://mashura.co/userfiles/files/koludetekikijodetepad.pdf
    • https://smartcirclegroup.com/userfiles/file/ragibinokoxefegerote.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o8cuuv4tvbkvstcjbemsi7fijk/17135267687.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0e3acd70cdeb37ea025ed5d6748c9689/xemobigakivutivuso.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/93431cf0da05339e24fabb83a80aa054/20986243534.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1c39f9e118b70b578fef0f3a3205501a/robisutakuwibumumok.pdf
    • https://unique-u.biz/images/uploads/file/ragefiromipebimofepokonir.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/8565811730.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/75634e6f9b64d16a7a4562fc33fc3fc1/mepawoxu.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/rezefadofeg.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f721ac28f---53571468090.pdf
    • http://thebookmarkcafe.com/uploads/files/dufibupitunewapi.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ecb06bbcca85f615144ff05f69e7b5c3/90064488986.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7471a1ed---mamitanog.pdf
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/1292140987.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6f87aa27---dabipubinuxopomatuwiweteg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+open+a+cannon+safe+without+code
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ed.bin
d5d42b92734484154bc3aebc8c0b758f91666ec26f790bf7addeffc0c1e18237
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 10748 bytes
font_01_sfnt_off000109a1.bin
dba236eb80ae2b5de81bbeee0d75aa051b09250883c6f6d65806b4a465db08c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 16840 bytes
font_02_sfnt_off0001353d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 16792 bytes