Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc07cedc9e013863…

MALICIOUS

PDF

68.3 KB Created: 2021-05-06 01:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a564306e44adddeca930eb67624e46c SHA-1: 27e439434a5121f40d815250bb52530d6f8b1ae3 SHA-256: fc07cedc9e0138638bab96a4cf74285819695f9fd7a77ec5fa21c5d510f965a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS uploads. The embedded URLs and the document's structure suggest an attempt to trick users into visiting potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b30d4cd1171396feaad7a2e9d013ddc5/68559689398.pdf In PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1e148047b0c82a2ef97fe34ae022e093/nepaf.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f169f70f7c3633f77c1af6490dc745a1/viwijaxubovawumajesomegu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/27665518776.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64285943a---57006842418.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3f28u9eliej2qned2ucdgc24tj/wesikitifekefidugo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/bobuxaxowedemefewugaxej.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/60b81682d291402405805a238985c297/bozuzobuk.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/9db7887884e152b9337cf61271e9f11e/fixadugevogumi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ecb7e206---40482927282.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d6260f8a0b2d2be6453d6bf1858b42a3/nakijukapafuboxuzinig.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160703f984fd96---pokerikigewafog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f58f5914ad8cdec2bd8c5db01909605b/56652494298.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160811ba0389aa---pupozofimuzeja.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/j48vvd9ttjtem6qa3761ckihh2/sepedazajavamekaxeviwisi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9baa7bc9a5f4fb19b0e6e9309ee6cc4b/bafewopofapozatixodebid.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607134f7729d7---58203596260.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/658b4109bc9249448cc5af7abd1a0a30/28052975071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bou+mariba+odia+song+dj+appuPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 5512 bytes
SHA-256: 48ef7504ad57b5f9ea6380ddd9c53bfa0187af1555092032df5c8751d5bc7127
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10212 bytes
SHA-256: c498e1941d9049d38bad7d06c892872f1fecbe17aa99867fbec544fc60369b29

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