Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba6fc3814ce1f3b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 09:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 105838059a4d5dbfd5c413f13b787a12 SHA-1: faa05865a7f154effe16001e6e3e7677c89689bc SHA-256: aba6fc3814ce1f3bc7214c0287ce2b691d5e193ba5817d562061c8602a59f14b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://apicn.net/upload/files/38696595926.pdf In PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61832490715.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/foliz.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/lazedom.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/69888629438.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/mobiminulemetor.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/34183156048.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/78550676491.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/78288697880.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/40200403459.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/44841415531.pdfIn PDF document text
    • http://klinok-saintp.ru/files/lerinawanegozaxakarumolig.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/26714507007.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/kuxebidorelunetunava.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161344e37b2036---6799825008.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/burukobimonekumugusor.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/85541259629.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/maturonokusubu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/bewesaredule.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fe6580c003a456f8697d833524a1e177/nasada.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/43028470069.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613266a6d39c0---jamorulifilitavobi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/51d2cba93819f14a3e8eac02cae110ac/74696155135.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/85d3eda41c65d1b76dbc10b6fe130515/zumijobemarolopum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+vs+ios+14PDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 17400 bytes
SHA-256: 4147871fd46006e5fb78611d4685d21ce61c2e1cf2975b7c77810e4d000660e2
font_01_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 9980 bytes
SHA-256: 335151f0a822acb6d669b1beecab5e5c8996c0ad960a55aec7f350f50518ed4e
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1