Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efa81a4984c9bce…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 07:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecac7d450866bb88ab4e64eea7d94557 SHA-1: 5ef2fb75af37100bbf092657e40eb7a6d778f1ea SHA-256: 0efa81a4984c9bce4fb909b5ba8a0523fa6ec055f8130c174fbd254b723559d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://badgerhillfarm.uk/xarulewaxijuwemuve.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6dc5208f---lebenipipizajuzimado.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zakulakavupazatimu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fac58c17cdeb60d3672563aa264a4e4/mivojufawuzomag.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/pijesawoxurorugudona.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mmp2tljlkss1tnl1l8ohoprapg/retabewolelalamekujokozu.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/82358197426.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f62d65d1fba---34023599892.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4137e78f23f80d6c8e3345f6f15da1b1/35149193628.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/gemilefonilajazuzulosi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca146a103c2---19578234367.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/42223810634.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfe331c13---99926117419.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/40331203101.pdfIn PDF document text
    • https://tipresentoio.it/images/file/balukukesigefodi.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/rojija.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/71155440043.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zawumidakatenovod.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/faviliwufugenovamagu.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/33797776091.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vp3b30ujobfv72au2c55b8a0nq/42771132485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ley+de+violencia+familiar+30364+pdf+modificatoriaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 17988 bytes
SHA-256: 4be57691d8ce7e901025f9c0f11bff09bbd6463ec226aeeb54d649cab24f68c7
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 11292 bytes
SHA-256: 768f5279cfd811cc56423ca3a4f330f6a468159c9f590a0926b393b44aa7a111
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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