Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e558a8b40773f0…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 07:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 422dced7c660a9e9884ea80f31a6d4fc SHA-1: 3ba62b9ae903dfc8d2505616dd5c6be3192ec88b SHA-256: 16e558a8b40773f0a7d267e6b8048d6cc3be03cccefdcd9bf1e30b59b35d933a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple external URIs and compromised CMS upload links points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://philabc.ru/uplcv?utm_term=lesson+2+theory+of+evolution+by+natural+selection+worksheet+answers PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/cc87b48a880468d7e516efc5cc4942d8/pesedegosexegi.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/80556062798.pdfIn PDF document text
    • http://signauction.net/userfiles/file/41933597107.pdfIn PDF document text
    • https://austarpharma.com/upload/files/ravonoresotisu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/23465524524.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb1449a75---89809169132.pdfIn PDF document text
    • https://drsaman.com/files/68270289539.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/64646997872.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/96121825885.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/loxilamedimamem.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c64de5e19f1---bijobatopobalilasusizuf.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/85025873085.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/51869685785.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d434ba7d2092742cd01e52fbb9664ad9/koneromofutojanufipuziful.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/sinitolexudeni.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/70885170664.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8ie5etq3js8cspglv8chjmp6j5/xutorofonubalesad.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608338d4baa04---xigomuv.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996934d736a---21085812290.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/femufesegapuk.pdfIn PDF document text
    • http://floramarble.com/uploads/lakonolule.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92425e280e---xoporiva.pdfIn PDF document text
    • 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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 16612 bytes
SHA-256: 0f8da2eab5281873b590f58cbac00da0646d230099d511a8555f82f4f15ba345
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 11108 bytes
SHA-256: a08f9143cbdd3fb7b3b667c67a0bf0d1658f5625aa27863246420368459ea5c5

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