Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5569969b241ee4…

MALICIOUS

PDF

93.9 KB Created: 2021-08-16 17:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 883ebfb543cb5a1718521b675970a112 SHA-1: 322e8b2518ab262ea3dfb07175f8d0b63117b1b7 SHA-256: fb5569969b241ee4625a39a506c6bcb2944b4a09dac7d31d167036ea6a0d9ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://peneleos.pl/userfiles/file/tizebijeretezojakomiku.pdf In PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/2998996834.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p0v8cq3p26qos9cgdu118j2r6s/79511782775.pdfIn PDF document text
    • http://bronia.org/userfiles/file/54941913612.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a71a7f36---dazudibiv.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/37346439494.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/916832ebd08c983aee98d74727c43a29/nukobosinoxexaxaxok.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/26334408980.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2skpot7c3ggnq0unfqje2m73ot/favojabotula.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a1968cd3---poduzorebuwaxakud.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/14095329577.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080322450367.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0cd6d9f0c3774cd0f09a3270697bc2bc/davoritakutiji.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918873ce03---fexazubusufak.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4935e46c---57691613448.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/28744848237.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/036cf5814aa88058e09bfd8b9048f0f2/84732236992.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/c569u078757qg0mfoc0f1onl76/53395737390.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3353e28b92b265fc32e9944a59e3f263/35133202017.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/nefisodotekaxewape.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b6ab3f83---sunur.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/11635307309.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/5012361425.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bejori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=communicative+competence+definition+british+councilPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cd43e2b017cf2d166428cde9987526ec/sisoxafoliruge.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_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 17280 bytes
SHA-256: 297fc57a66ed45570958542d6cb99b7cdd1f313396a24b642ac23d553f7e551b
font_01_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E80 11220 bytes
SHA-256: d15edfe756c7d8ba7359cacecd8c3d8867026163f0fa0f1b3ef75ea7b3b238b6