Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc637a1e255c153…

MALICIOUS

PDF

91.6 KB Created: 2021-06-29 05:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 611006ce74513a896cb93ec08c2a00de SHA-1: a9ac6097a83038dd4f628db8c876052e1c97101c SHA-256: ffc637a1e255c15347a19b352f1019f3e6cef4b78d66a2cf1610407de0309865
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/42c737812614646c5a79bb8957bea3e1/41101218426.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/gukukisonilafemiw.pdf
    • http://alexandercdg.com/clients/36029/File/22811541298.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090937b42404---89299039656.pdf
    • https://poolpoint.be/uploads/file/76007613582.pdf
    • http://haithuanphat.com/uploads/files/99234556115.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2ecb6676---30754314626.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0aa0458f8ff3f51680156653b11cc2aa/gusifipuferimo.pdf
    • http://gerocuki.hu/user/file/43474232324.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/42059157015.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5bab824c64a395b5162649ea7bf897d9/43305526994.pdf
    • http://shinex-auto.com/userfiles/file/31280927953.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3de33c2b8---32991940664.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qn2s64q4mq6j5g81vlu6n5aa8a/sikiroretukimigodome.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/639t8b7af0f6tcde9i892fiio6/lelerejapegaxom.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0beb74b40---topurodojapigusuwe.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9cab7448c8763696c1b2cb10a89bbf93/93134447556.pdf
    • http://pattersonandoliphantfamily.com/clients/875492/File/77205692718.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a663864d000---govivezavitiwawejiluxedek.pdf
    • http://ersatzmonitor.de/userfiles/file/82111474621.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/881b0aabe798b13a331947886705d38f/98673187497.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a860d45de74160ea98e803e04d1778e7/62183601578.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d5e0d8f6f0d16e3fc1071ab80e80544c/15756768473.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=multiple+choice+questions+and+answers+on+demography
    • 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_off00010287.bin
b4b02c7e63f0df321421c712e2a51ab28be330fd31d32b65e292a69ebd9f9c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 16872 bytes
font_01_sfnt_off00012ea5.bin
9781c7949be20c6168b31843695e098a2511c8b8bfbcf660ae0cf372e95f13c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 11400 bytes
font_02_sfnt_off000148f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148F0 16792 bytes