Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fef6431c40f45d…

MALICIOUS

PDF

67.5 KB Created: 2021-09-17 20:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd169b7aca396e8cda6068f71f7d7ff3 SHA-1: d571a20d1d52bac6e4763db19c5e5204d6aa0f2e SHA-256: 84fef6431c40f45ded3a747d48121ec8f27538ade2c7c4635983a9881cfdee65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links to external websites. The presence of numerous URLs, many hosted on compromised CMS platforms or disposable domains, strongly suggests an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=stream+football+matches PDF link annotation
    • http://friulanamarmi.it/images/file/pikeza.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614025c9950b3---64154384115.pdfIn PDF document text
    • https://znalac.com/userfiles/file/35266377669.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/41984411225.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/10403711993.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/nanixabilewuluvotog.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5835cff552567bc055faf52531b14e02/41328226499.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/nugumizesesaduxezixupu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bumaralufoku.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/64106415720.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/46807350850.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/ligilajodu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/51381591803.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/47543134505.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/58303077504.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0hu2eq9oq5f7lq6ucggfrei510/werebogofufa.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/siwukipevuv.pdfIn PDF document text
    • https://bor-diing.com/upload/files/litinibe.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/78732330923.pdfIn PDF document text
    • http://medrea.ru/upload/files/mipiweba.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/fudebujosijo.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/41978225500.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_off0000ad75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 10620 bytes
SHA-256: acdac7950da7766dc3518c1312dc3504f69f7e3a0b8dcbf0cc98de7438a1bd93
font_02_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 14084 bytes
SHA-256: 669fffa21bece09b8d8bdedad18e243364561652feb93fa74507c37ac475ecf8

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