Malicious PDF — malware analysis report

Static analysis result for SHA-256 746cbfe09a22d960…

MALICIOUS

PDF

96.8 KB Created: 2021-06-27 13:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac37bc4ac742f0064a1af0b95ee07674 SHA-1: 879441fc2b1d49225159bf0a2e4b9b8cb0a5d8b0 SHA-256: 746cbfe09a22d960ace62e0fb3340854cd69a57fd0f57a79019e6297cfb2520c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qds85881st0ttin69frjjv690h/sovabebonipoguwijodawesat.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e57bc2588ded0fd0e1f908372b01b60/siwupotuwozisoba.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf6a715ff---firimanedinaxunukabu.pdf
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/tarewegezanipudowumolo.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/dotuxamodejagujatigisapiz.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6dd9acc7---74808018589.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/c2654b30dc9b9e9c5758fd6d1124f37f/dakalifogetadamosafonuv.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/bsssntpmf14l4qofvcpvaghho2/rigimuwolawiposizida.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/39866827216.pdf
    • http://colafranceschi.it/userfiles/files/7823571888.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe2d2c957---53958049279.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775618c8052---38074884643.pdf
    • https://chuyennhakienvangvn.net/upload/files/vuzuvu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac14a743c---54495749414.pdf
    • http://murielbellhomes.com/userfiles/files/xosotikaruwubapowexujizi.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af6be0aef---96242181043.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec70f0eb3b---zebulenurajuk.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f729b03c4580fc76037426960dea3a99/tawufizejeviko.pdf
    • http://cottoneauto.it/userfiles/files/pexat.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f9342c8ce7d6d77f31056b24fe28c7c5/lesekajopulerazafafodu.pdf
    • http://0851gay.org/userfiles/202106file/2021061321414870554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dimensions+of+a+quarter+section+of+land
    • 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_off00011a0e.bin
1f141bca5d00e1299fda147c0ba17f5ecc4599ef0065239eecb0afe7fdb331ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 10884 bytes
font_01_sfnt_off000132ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes
font_02_sfnt_off00014b11.bin
a5b0dcebb1961606175c56677659b71fa4f2aad7e9ad4e68374ffa183c85739b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 16628 bytes