Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4594ce794ff7a72…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 13:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04712eca4763ca6de5d97ccb24b6c659 SHA-1: 99d866374f1f72dcf08bb2369ab44cb4b3dae959 SHA-256: e4594ce794ff7a7271f09e29dca315a6436ba54da5cdbf2ab0e3dd590143bf67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, with one pointing to a compromised WordPress upload directory, suggesting it's part of a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number, a common tactic in tech support scams or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/reniremuwojene.pdf In PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jilejafagej.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7eb6c51c---xovizunilil.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/dosaxoxemumopumarefa.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/7596607748.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/32633072868.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/87265269377.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/28243558413.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/42864579447.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62666337683.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/webuvikitudugumowotumanug.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/jovibufemanaxesobokud.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/riferujejogenobusevo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/ce3368573d0d47d67918450fc47bc7f8.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/daganuvugebema.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/sijukobadarijale.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/samubilula.pdfIn PDF document text
    • http://7profi.net/userfiles/file/xizefodezinilom.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484993a194b---vogokuxematetipumupeg.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/65334384043.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/64703241592.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/36461258291.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8ff12a76351564ef39fe54b2a9291dd3/21239288718.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/vadagi.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/34708226988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=math+focus+5+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 10472 bytes
SHA-256: d9742ec80c982313a1fbb04bd303e2fbfbf3c000abcf5291a15423742fdfce63
font_02_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16584 bytes
SHA-256: 572c4d467946c2809455d721c19b9dd4c7eaead9c5ff1087adb64da6a60021c1

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