Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d28b6c812da59f…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 04:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cdaafbe4bf5208c9ed73a85961f3bd3 SHA-1: 1558430c7b6f6644d5987a824ed441147f08d4bf SHA-256: 53d28b6c812da59fcc6cc9839ffdb7a5f036af503422ecd7f8108f01d1a58013
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL destinations strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726eae5ad6b---46589151361.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/dexeguvunivokidafivize.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c7b7c3bdee82f812a3ce9fb779dbe759/lutigojisasenexe.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/pikemo.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/558bc7u7qkfe8fl1op82556dn0/56271959048.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/49711600519.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f650091755---bofokujezagoxijuxagaju.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33ebe7e9ee---xemifite.pdf
    • http://envigest.cz/upload/file/rizosu.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160839d39dcecd---7653764267.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/he80nvs7lc5rc2ga1vo0kmrq31/zufijabitoruxuxilize.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n3f7t86ak79fp5iv0jqm3sgm71/litoxiwonofakogubemozot.pdf
    • http://traiteur-ribot.fr/userfiles/file/zituwelitovogano.pdf
    • http://st-ark.it/userfiles/files/lakukeruguxajul.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/86a95277b0248af649277f5c987e5b2d/68252477849.pdf
    • http://allprintusa.com/admin/images/file/lafifeset.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/743754c801ab25f7535fdc05005fecf3/pajipijemimexipamekovi.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/90e6d942b703c309acf36e00231d6b5d/gigobukiv.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/61575235189.pdf
    • https://arhstroi.by/uploads/files/dupuvapemobigokexe.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fac5ac78b64474df9a086861e89d550a/53586807737.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/86a455015c34398d0f76886731103db2/kuponodowuwetoz.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c0221877a4c8a830c4ce3698a51ffa6/86538498964.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53773824489.pdf
    • http://aristosaigonhotel.vn/uploads/files/79244054853.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc02d4ec4---lalov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=traffic+rules+for+car
    • 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_off0000f28b.bin
87f9193dd85ae5454911b9690646bbeef3cde7153c4fc236e06913b766b4a6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 10188 bytes
font_01_sfnt_off0001097c.bin
b76dfea17e31685a972574384bc7b8818c839eda45bb5371d8600e3ae8b658e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 17152 bytes
font_02_sfnt_off000135c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16792 bytes