Malicious PDF — malware analysis report

Static analysis result for SHA-256 901fc0a315171da9…

MALICIOUS

PDF

188.7 KB Created: 2021-07-03 00:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 500fc506f354ec6ad0a7c4776b05e8aa SHA-1: 22da394e4c6ff89a4c07fda821d21c9cf3bf3506 SHA-256: 901fc0a315171da9d3d08205ee1c65c25b25c033b930a7665ea1ccc653d57da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a0bc4204a91cf724d6434bd49e034f91/kepasodokizajamag.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/1796374612.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3158b5038a40b5978457c94634dcb155/27256858881.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62636855402.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab266cac5---xajonurexuvomixin.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e29b9d0d830620a4ef04b8e744391456/nezowawumimitudu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8506dfb2a---minuparuvot.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c5566488a81b6a85f4f784a50ee7a49b/jeramupegusi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c192b239---jasowuwuwometo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c430141d3e---mitizedev.pdfIn PDF document text
    • http://atek-ent.com/upload/file/40222492970.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0a3mjd87d5hqhk436h6k095a3l/fujirilogidepupofuve.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/kolufudemawod.pdfIn PDF document text
    • http://qca.ch/userfiles/file/13273618706.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/vodeda.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c472ae6bfabda8801608c507598a0337/37625053965.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/93ade24bceaaad96c205546d87f31b30/runane.pdfIn PDF document text
    • https://506hlapeta.com/files/file/18208130466.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jp7nd02a10k6halv1gcj7shg02/69760522379.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77609987---47654713195.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785f9c4f8---58224085503.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a9a2343e---bolebolepamobikemokuzuku.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fe6930d0---womizemupabejapaso.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/78467855574.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/pigazupepudimimit.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/ditaxodox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=be+holy+because+i+am+holy+bible+versePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000259cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259CF 30004 bytes
SHA-256: c6903bb0127b977deac2322e76ff09da00a699ef40ee5222f8eb8493e1e12de4
font_01_sfnt_off00029a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29A37 10764 bytes
SHA-256: 1269ac98bbeffa7e777f96098851ebd4c6a79a3b28990b1d94b2a5b397499e6e
font_02_sfnt_off0002b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B301 16680 bytes
SHA-256: 1ed72d45656953e036e7e9351314551f8e479b9c4b6839b23e7b0da229bb661e
font_03_sfnt_off0002caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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