Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9f639bc5709b1e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 12:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 39273344622054c449c2affa15296f25 SHA-1: 8c7c327de7b8d0480c5b377706f3d8761871b43a SHA-256: ae9f639bc5709b1e173990588303dfd38cf214b5c5feb5c2579cc54d01b615c1
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing lure, including a callback lure and a fake download button. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of numerous links to potentially compromised or disposable domains points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fafenozufofamusuvobuf.pdf In PDF document text
    • http://ps-chiptuning.hu/userfiles/files/5975896129.pdfIn PDF document text
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/nexefiteribizaxifigazibo.pdfIn PDF document text
    • http://opsir.eu/files/file/4272128906.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d771aec5c9af85fc6bb8b3db77744d45/fobokaguzim.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/37993919760.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/9006249059.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/pazusobonavabewimebemegi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/96631642134.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2ca328973cbb40b577a0916ac476e082/17701822777.pdfIn PDF document text
    • http://rayer.cn/d/files/3191530010.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/kananidowafukokojonu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614297da5db22---gonobawubikajak.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/74040941183.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/pumuwuzi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe30f398c---95510061428.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/q7se777jt8cgi420bjq1nu5q8a/85646926653.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/37212026848.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/dozesuvujukamitufaxe.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/98219141761.pdfIn PDF document text
    • http://hoakhanh.vn/uploads/image/files/23619451802.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/fisidekozoboxesolurufel.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907093150.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/97604546157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ramaiya+vastavaiya+full+movie+watch+onlinePDF 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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 10912 bytes
SHA-256: da06495a89a78df2e244d8100d87e8df5e18114175ca64d94790e1b4b7fc3aba
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 18088 bytes
SHA-256: bed5eecfecbdb6696d461575917728f3692c036416a26ef20e479aa7b6746ec4