Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbb2ef27a6bbfa1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-04 03:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39ab29afc75f95b3ba5861680cdb9081 SHA-1: 9d9289173cc13e620218d934fc6c6c2fd44aafaf SHA-256: fcbb2ef27a6bbfa1d8bf3cbabfeaf0f1a28ca96c9d0b02dd8ec15dc43abb5013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised websites or disposable domains, likely to host malicious content or phishing pages. The PDF structure itself is not inherently malicious, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=serology+notes+pdf PDF link annotation
    • http://bjallstar.com/upload/file/71719024373.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0e133226---lopabofuvupuzokorak.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/68212030514.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/xetowipokujebemamutapegew.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a036c6bd7e2---nivavataxabokufafisiwewu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5a5adb60ed00db3f778da1e26ef541bc/85826061300.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8e3b979817c33f9e81b43fd134759ae8/74567704608.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5e3e0705---biwilidulenewawek.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2064478367193a9e8816ac2b49e61fe3/94659908646.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606efce9925a3---40558576424.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/85558681828.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a29b4c5a28ffadbceee453a831f57b96/26482606753.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/6fd613fc2ee48707ce39989ea33bd4f8/josenovo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/tunokiradobilakekituda.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/jifumaka.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/89316900961.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/48c154c6c6749b95824afcd71913dd2b/guzozovataniziga.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16228098921117.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/dowupawuxaramet.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/guzefudebiju.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/70761446958.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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 14888 bytes
SHA-256: 25212f88440ff20f375cb9468c89ae118f12ea616d6a31d156a470c6eb9409da
font_02_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10608 bytes
SHA-256: c2a609dd663e7458fb07c3e79fa5ead3461b6380b6a458d475aff286bc8e62d5

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