Malicious PDF — malware analysis report

Static analysis result for SHA-256 4681be0f3bb93588…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 08:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dd161cb59a14e5f44b7e09099bdbba0 SHA-1: 659a34e87bbb600c2096f64080a22c56f6b7a7ac SHA-256: 4681be0f3bb935886807aaebdd6b71132867ade8eeba252e8879393a745ffc72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2ffefbec979e4c7fdb42c2ae6de7d541/84007432532.pdf
    • https://melz-feu.ru/upload/62788795674.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/aeda81d7e3359f5ce14a317294ce10f0/mijugadelut.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0ff1a259---redesat.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0b50u9e78lr0k3ucu3n727kdmm/kavexawataxe.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/a5pmthlir5uhdvej2aue5vcgt7/7023348183.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/989c1a2ceea2bc032a88b037ac3cef4a/39182336631.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8a1755066454e3ccdb8d35a3f913bd9a/sovegexefufobowilul.pdf
    • http://animalscipublisher.com/files/upfiles/file/50815826793.pdf
    • http://spc1991.com/ckfinder/userfiles/files/pudukazog.pdf
    • https://allcreaturesinc.com/files/files/wurekolamuromipizozovi.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ed5fadeb916a438e9223810bb15d203a/marosazusepefurumarezagi.pdf
    • https://bor-diing.com/upload/files/58649531814.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/133e92d827ce19d539ca242577c9221b/xomalobibibojakifosa.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608615da35e9a---52562480420.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/dee6dc1234fff9ad838d7f35e83e0c27/dilifatenamitab.pdf
    • http://pappteam.hu/userfiles/file/18683214954.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e610ecc2---galimupoko.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2ac284c6---dobikobifevup.pdf
    • http://clingac.com/d/files/vatoninosekujodosisikoz.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a8032312a9---niwamej.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/no9dmie6uto1r2e51bk50vn84h/rowogupubovofunulifoseker.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a85a731509---8399820549.pdf
    • http://musorcentrum.hu/files/article/file/38660958029.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614092622997896.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+double+cookie+recipe
    • 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_off0000eedf.bin
ef010d8adf9753a122467fdb2c30edf598624f8c275e3633ed682a230a304db0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 16916 bytes
font_01_sfnt_off00011af4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 16792 bytes
font_02_sfnt_off0001330b.bin
80248abd8864ba58f21c6ec6e9d5c244e2bc94558411e4937ecc605f1fcda1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 10484 bytes