Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11982db5211536f…

MALICIOUS

PDF

97.0 KB Created: 2021-07-21 20:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47d9455bfd0ad86ebc9999886d90cf4a SHA-1: e2819e59f4b74d8d580f70e75cf15f752013ffd4 SHA-256: a11982db5211536f37d4c1f5bc6fd77d380833e5063ceff2808f63540a6e0fd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2f37bb26211a40bcf2d5d15fb001e5d3/91350122613.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56fa9e0e4---13982943756.pdf
    • http://m2m2design.com/userfiles/92995824785.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e718e89b---zusoxuxokazovaj.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843750679bc---puforirix.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/30871988493.pdf
    • https://bestcoloringpages.com/userfiles/file/85438232639.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6ebc3dba---97310958601.pdf
    • http://stardentalcare.org/userfiles/file/musivofe.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0i3cpao6lh5e864h3rkgml38p3/90096339469.pdf
    • http://isystem.hu/ckfinder/userfiles/files/mitaripejo.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/hnce2n4jq00fmvvpng7a604jcu/birelubijofifalovas.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c530d8a4b---3921866399.pdf
    • http://aaaexpressac.com/userfiles/file/remetamotawoxaveke.pdf
    • http://www.bufolari.com/public/immagini/file/45688070715.pdf
    • http://bogelaipigeon.com/upload/file/dijoxijomodozujisa.pdf
    • http://afghansolar.com/userfiles/file/68289032060.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7f69a98ecebde68e6b5c8c33db957b87/pukosaromididorefu.pdf
    • http://realloans.com/clients/73966/File/luzixos.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e07c0138---jusojoxaloxupopuguduna.pdf
    • https://clumba-indoor.ru/files/files/49705852643.pdf
    • http://tai-yang.tw/taiyang/upload/file/vojubutozojitifepatulu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a6330ad4a---repiwipotoritu.pdf
    • https://irantruck.ir/data/file/sifujuvasifavexa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=charlize+theron+winter%27s+war
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011534.bin
1f7993c1eb178ced97f64767b226c83d5145cf5b71f8c8fa47057d97d32bc96e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10416 bytes
font_01_sfnt_off00012ced.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16792 bytes
font_02_sfnt_off000144ff.bin
ed4fc10adb29d7d203fe05d80dc78d1df66ed83e8879e677b679dda5f830cf32
pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 18500 bytes