Malicious PDF — malware analysis report

Static analysis result for SHA-256 37af5b09c60177ee…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 300d9eb45c5b9fadd4c484bccaf774b0 SHA-1: 939751737d8a0fb36e83d504312f1345a5de75ff SHA-256: 37af5b09c60177ee1fa72bee9a2ac560b6b8040592924f14c24532535e31f493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute or host malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf51d8446b---49736449468.pdf In PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/19547562614.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/92058823738.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/57502729849.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/49804038700.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160940d6fc6f51---35893569960.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/74772791250.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bibuwebemirodolawoxod.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4dmm2stv2ksskrmpk38av9cbuf/99508489371.pdfIn PDF document text
    • http://glttek.com/userfiles/file/65690754935.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/pawuselimujobazi.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/12744253092.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/57471482653.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/newipotefunapukinawex.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/sowukasejajirakiwezejuwi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce57f68040---49503646539.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/kiwusenurasuri.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/uptmjk95s36a0c4qm9uuuq9hv4/55234593696.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/95570114482.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/kalinubasewibodasososewi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610643f4eb775---34185193316.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72aae28438---42237268603.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/befufe.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210904211722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=signal+integrity+issues+and+printed+circuit+board+design+pdf+downloadPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/80638942412.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://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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 15924 bytes
SHA-256: 1e4e4104c3e7702176fdb5477c9c6122011175c8e15837a412f175f86c2abc51
font_01_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 11308 bytes
SHA-256: 2dc1ab7b42eeaffc0735bde306f970ec30ca44c7ccc7e1331eb2eb2f78026657

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