Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ed27982dd52a14…

MALICIOUS

PDF

124.5 KB Created: 2021-07-07 09:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5699f7fa830ec9afd2cc400162421a5b SHA-1: 83a7af92b9da5b134acd2540f55d71de43cf9dd1 SHA-256: 21ed27982dd52a14a3cae6c78d9eddfef0eff5dc19e2086a54b8bba658aec529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://108pizza.pl/uploads/userfiles/files/vexokaninimek.pdf In PDF document text
    • http://parzenica-bialka.pl/userfiles/files/kizudaropofudujolofuzur.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fc75cf2b0b2604b4b87794021c9bcd10/58489062259.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/75647254942.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/nebisozipuraginixeroduja.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085020c89129---refupo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tkeoui9hecp1pcigt2u5voib64/73614082843.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/vojap.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4542b8d97a5dc32760fe18f44855f490/44690532112.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e505739606---daxuwupiwimirijuli.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/tifalo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8fdaa63e3f0e11dc304bf41a2d587e0f/98778663527.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7a101f70---19208699686.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0209b10d64---gikesefesijalopidijew.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9uotvi6f4k1n8i1nnnp5dsi2ce/27233003347.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c7cb7380---wisuxekurutafofasu.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/33028934254.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b32883a1d---fogawirimagibotifapa.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/017ab1583c6befb03f8f7d8a0d9b0b59/66041704750.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a320ae2d5d5---65938025032.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b81cff7fbb0---ravapurado.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/51abfdd4ebc4ae26e198e758e60275e6/lonokikuserozo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516065939557442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=weathering+and+erosion+crossword+answersPDF 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_off000183d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE6 18260 bytes
SHA-256: 975c885624b1a0ea87a55a6741b573db660aef1c9b33bba103b7fb599260e5d8
font_02_sfnt_off0001cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC47 10684 bytes
SHA-256: dfc7814824837c4f3514b61d35f83a2ccd2eb536c4da16c892da5c977bd6815d

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