Malicious PDF — malware analysis report

Static analysis result for SHA-256 05226cb17fb28a3a…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 14:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90b16fbba1a0336df770bd345fb16130 SHA-1: f2b542bac34f3783f281b830bc502ae42b6aab15 SHA-256: 05226cb17fb28a3a80070b6e94a37c1bb54faed94260271970f200a8db0bf5bc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document body being heavily obfuscated and unreadable. The primary attack pattern involves luring users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6e884190---38858627964.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3c37d916394523a8fd39deba710d761/surebufurexu.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b350f48b35---xabajujugezazaginezof.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/h8c44kv8sfbdp1pnmmeq3uqbmk/70593867423.pdf
    • http://xboxheerlen.nl/userfiles/file/pisaz.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd1fd28c9---vonabipukegevamimuzov.pdf
    • https://zlatartopalovic.rs//files/bulonanokazafazitakuwuri.pdf
    • http://vimar.ua/userfiles/files/kirunuleboxarivo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083edac364a6---paposavep.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f26e8c91264c04e973c6125249178be8/dadunoluvakufiluvelele.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/67246afb39b667d7854b2ac6b9c05927/8746479424.pdf
    • http://altelaw.com/uploads/image/file/matexutawuwe.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bb81fcd9f76fdfcbe9d4cb93d6b7424b/dufuluja.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b696ce1d---38015083045.pdf
    • https://bczenekar.hu/files/file/sivevavewudesabitigo.pdf
    • https://k-newsletter.com/ckupload/files/72286565160.pdf
    • https://planet-for-events.de/userfiles/file/45061193658.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a3b07be23c92ab5e40cb23657f4ee32e/lutinadinenibelabemin.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/05aafb4a653d4f26c96aeb6c8873d59f/fexuvesabax.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee6f0d0a8---34880272588.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273fd3b9e8---fimilejela.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c94eb4e625e---99761118149.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1701071fcdc39b62da6cd35846bdd73/13911482843.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5k2dqmn48b9hba50djr7lfvhs8/48129777140.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57281dd1f---kagatixepomuwoz.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e4e84c36---guzopukaradep.pdf
    • https://brianhigbielaw.com/UserFiles/file/84628410450.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd87f5802ab---92145515543.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=another+word+for+bad
    • 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_off0000f627.bin
d8d43b09439fa9f02528d1338ff1c08a5c15f1e998194632f93187662b205ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10352 bytes
font_01_sfnt_off00010d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16792 bytes
font_02_sfnt_off0001259e.bin
17f7297160cf59698c5fdfd07ef471fe1044dfac6cd0a2d21c32e5ca884ea729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 17988 bytes

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