Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad203156a3d77b59…

MALICIOUS

PDF

100.4 KB Created: 2021-06-28 03:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 117e75cced74e927e9bbe920a8923164 SHA-1: b0706c73272fba501359cbd1cd1abd92c7963d16 SHA-256: ad203156a3d77b5991b230bef9babc7f1f6906821119746404e3b876e09c6920
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://bienbao.org/uploads/files/suririsebowuxabaji.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607476e440934---vurotile.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944020bf00c---28433214247.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/pajuzefesematoxazitoxo.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ctubfhs9es32dmc78l0956bg33/17672071103.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aed06171---fopaxonamikexawiguxo.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8723b180---nuvuxuxiriro.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d92c4031b---45446686419.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/mibijenalapovukerolep.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0f18437f---jofoduromuruwok.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3fe71c8b0557e28f9145e670551c7dae/21315385015.pdf
    • https://moto-trend.cz/public/files/fck/file/94882010198.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3675fbb8---nenumasomitaduzof.pdf
    • http://taskentcompany.com/userfiles/file/81104939787.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a6595c6c7028780e3a98f2af747ee471/mukor.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7k7gnr5ggh8pb6j47q4d2pv2h7/71908326777.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73527d3e1---33946584863.pdf
    • http://billedbutikken.dk/articlefiles/file/8735606188.pdf
    • https://luyenthitoeic.info/userfiles/file/nazoduk.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/dac27872ea51b4bf3c6a482c2673b866/13839199312.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8623c9112c68e890241cbe1c0246d1c3/napatiburudedolozoretom.pdf
    • http://alexlunacoach.com/img/editor/file/95031928748.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/34327285495.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/61697605656.pdf
    • http://thessalonikiflights.com/files/files/fanobopusadiwitawateri.pdf
    • http://www.pattyn360.com/upload/forum/files/50167795206.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076716425218---32367663452.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=serial+number+adobe+collection+cs6
    • 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_off000125d9.bin
e08e878c37f89d3d163bc96a36f5c73d77ae642150a6a13b04a00bddabdc33e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 11016 bytes
font_01_sfnt_off00013f61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16792 bytes
font_02_sfnt_off00015773.bin
dee918a861c728c28da3d3fa1669fa0969a7c2010e30420597d055cb6956cf08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15773 17144 bytes

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