Malicious PDF — malware analysis report

Static analysis result for SHA-256 7939b01c720cd618…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 02:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c02dff4fa925b327e11cf69f6f27f11c SHA-1: 8dc614d8edf447647470d751f24cf00973064f29 SHA-256: 7939b01c720cd618b3834767bed730243f03f7bbb2df37da7f0c1d1695b9f1e2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple distinct hosts and a high number of links per host indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/rulekozutolupasabuledazas.pdf In PDF document text
    • https://unitjaya.com/contents//files/fizivopajawabepovabumif.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5fccr4oht5gobc03i6qrevdobd/munerazojufanadones.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71f317cf1e9839c9088c465aa1ed5796/vagobinabavida.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096723bdad97---gakiromufebumabum.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/70545812ae7d5b489086908ef3a66e05/16720792845.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdd4c691d2---37082921810.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c498e69ea85---73552636539.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a978a37585c---getegutitilukoza.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/fulapakajojedimagiwe.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kaneduda.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n1tvdd301nih572157tvbnj9cf/vuripatanuresutefepitu.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/piviwebajasum.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbafc8d5fc---jajiwejixejelolo.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/71897101840.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tobarupunerovidipiguz.pdfIn PDF document text
    • http://artospace.com/pics/file/54133868153.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/pewujidoranakevadevo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a75c626cd---bazaweronem.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca33dff1fb468e8aa86c14684436668e/5818441533.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/25055678779.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/1149293193.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/bizozimapupipexega.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rpb5qkpqdp8nbkti6av26sjhro/99088742638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=couple+adopts+triplets+but+the+unexpected+happensPDF 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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 16680 bytes
SHA-256: 9eb7dc5563e12ac4f37422ed075dc6596e310e59f2688943b9a6c52c1695d2d2
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10984 bytes
SHA-256: 0e0d4190350cd110808eeb3e2f7804dbc85f80d6922a51316b755fd49092dd03
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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