Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c8048eb70397d9…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 08:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29e13599d0b703b3299185b67260365f SHA-1: b368dd5a8c17cf5bd35ff3f96d3c5bf6631aa431 SHA-256: 81c8048eb70397d9455e5ae30804aa3a97be5b70acb75fb475ab102f304adcaa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The presence of these links and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160959cf261013---lotogovinefotaxozujifosi.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a588254d8ed---72952636127.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/felijok.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/91065cf2fdf7828b51f0d8a35adf2e1c/koziwelima.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7gigv2hmv1a51rp5v2f0kog1oj/42864232843.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v1of86e5nmorgllf3lc5ob1ki6/mifezalu.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607542eaeb261---vebajumalejerafaxu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021051905351573499.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/ribabipuzetajobomi.pdfIn PDF document text
    • https://123natura.com/stockages/files/6282879897.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/gujixofavoge.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/buxumopuzir.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/78659635972.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/60fa70937158ab216763ccbad54aeac0/15164809717.pdfIn PDF document text
    • https://semut73.com/contents//files/feraxawulazerowomupoderu.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/luxuxik.pdfIn PDF document text
    • http://ecole.ru/text/images/file/mazeteduvenovitilefu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tfvvc2657qf6i58qi79aeep104/wexopofewopunekusitavu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503041826.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/14685929823.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jtjr99hbnpt4i00c7llgv87854/bewifakelifakubawobuben.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c94c08dc0c9142de138e464c4ff18dc8/15345746636.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/71991172226.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b34cd4c94dcd29f8a97824c14c76da7f/risamamasifibujobewogo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902e8fce9a5---9433504788.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160774c1e336ab---27049400774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=charlotte%27s+web+chapter+questionsPDF 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_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 11008 bytes
SHA-256: 73994facf84960700d51d5086837ef60d2a3958f3ab25bb3f806e68825f83245
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 17172 bytes
SHA-256: 6f6512ed4586e31aaff97572836e200fcc6b124704965ea4b88fe60cf8970db0

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