Malicious PDF — malware analysis report

Static analysis result for SHA-256 8034018880503796…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 07:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76122e9f36147565de896103b71652f4 SHA-1: 35b701847ad4b0520cb6a282cd6b996f399ac34d SHA-256: 80340188805037962d7c3dfd08c07d5244d6c992840a556151fdfbc3d4407bef
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to domains that appear to be disposable or compromised, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external URIs and link farm indicators strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://amindoost.ir/images/upload/files/kisufojogebakup.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/japor.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/punuxadowejukolig.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/77994509768.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ccc2f7f---lemozovimatoradevoxog.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/69680504404.pdfIn PDF document text
    • https://beautydent.hu/editor_up/35853642705.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/90130104549.pdfIn PDF document text
    • https://airshow-bg.com/file/55119800053.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/84403577830.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kajosawenowaxegaza.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/xovudelejideruk.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/73597141501.pdfIn PDF document text
    • http://shesob.com/file/files/zuregimanewumezageneni.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/limojodixokufijosege.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/89975880872.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/1860591180.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/mujegevoduvefobatanaxemej.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/situbozosujasizerijaz.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/56989036087.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135928c896a2---bepipozopudimoreroti.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/59781887903.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9bd18939ef08a0332ab5b2dc879ae0d7/97599629077.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908134242659753.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/3016323119.pdfIn PDF document text
    • http://termocity.by/pics/files/91673231760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=donnie+mcclurkin+caribbean+medley+lyricsPDF 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_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 17212 bytes
SHA-256: 985209c93f9432533a497a9400c07c95c301888c08a03ec01ff8e232269fc0e0
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 10880 bytes
SHA-256: 8894f2c22369e46890f1ab112cdf4c45556c8aca16ef8563683caaf4469cb6bd
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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