Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f94958da97c0c1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 12:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e04e4ea41c6557a175d120a2dc31d4d SHA-1: b66d37150e5c6cfe945afbfd3cdbe4151065a1c6 SHA-256: 45f94958da97c0c1e9e026492c70c1a56a437c900b19721827c04f4a843db20d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=suicide+squad+2016+full+movie+watch+online
    • http://canadapremiumlubes.com/survey/userfiles/files/tizebowomevapetazazagulu.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad421f47c---97303560261.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5qv9gb5iggor9h18c71tu64ot7/13453669927.pdf
    • http://dh-life.com/ckfinder/userfiles/files/87423076018.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb392b624---duvafaradogi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae7eab2349---wobufej.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lsclu938nsboofha7o9n0mhia7/tilowalojo.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1eb3e42a4f5e80e8e9aeb759e0329133/31131923045.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2d08f48c---xiwufafukizenoburofeg.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/22686862304.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qcf4nj0u2a3i6cmhml8pacf2r5/golatenoniwaruvet.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/63f62b983a34c2cfe1e8b5777844583f/zobutosizejamupukanuvotul.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bb3892c3f46371cad64063d4ad769ec2/62093764771.pdf
    • https://mecaniquekd.ca/upload/file/tuxugik.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081292a06db0---razuxilukofavefapela.pdf
    • http://alemotta.com/resources/original/file/nowisekaju.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af7263e41---11914821714.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/29597925503.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4f0ff7fcef91c469bb8ead9e49a57be4/wanarikiwib.pdf
    • https://mygo.com/ckfinder/userfiles/files/41884804261.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c8303cc1c98bedc6186b831582b9cea2/zilofufetabedusata.pdf
    • https://nestsearch.in/admin/uploads/file/lotazelanunezetepelene.pdf
    • 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_off0000ee54.bin
71a89631fa57694f6caa56f128bb3604050d826c64955d9b2aed85d129aed889
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 11576 bytes
font_01_sfnt_off0001098a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 16792 bytes
font_02_sfnt_off0001219c.bin
8fe8f5c192698e35f85296d1925f94fa48a71082ffd99e16ed2f04b1e459c6fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 17612 bytes