Malicious PDF — malware analysis report

Static analysis result for SHA-256 525f028206123bc8…

MALICIOUS

PDF

87.4 KB Created: 2021-08-29 16:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4224582d334011cb94e7ea628a67e0db SHA-1: 8f8e0471e0d4508dbcf96e9dc642862c3a98dfea SHA-256: 525f028206123bc8686e40597b03ed46eecfc48540d4c78a77e0d53283336b48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://mobydick-band.de/fckdata/file/60824499003.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b6c49c07f392c8553f604aa228eb3887/sugedipul.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/0789f6719bace9ef2a3d19b0215aa47d/lupojika.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6339db2663---fapureludejadisebuz.pdf
    • http://liubeauty.com/luutru/files/varup.pdf
    • https://pergamine.com/ckfinder/userfiles/files/51647461899.pdf
    • http://hiredriver.com/uploads/assets/files/54387433349.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d4441592a547c414bd4e2ec492cb0fd7/bomelupuperumutufotex.pdf
    • http://sahrugs.com/userfiles/file/36871266314.pdf
    • https://eccdc.org/application/webroot/userfiles/file/40823985866.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/102ec4742315b2fb74301bb0dedae578/2463136075.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/boxexilakimosesiwa.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vuduva.pdf
    • https://inverpalmas.site/aym_image/files/80951206490.pdf
    • https://pima-alarms.net/slicice/file/96755298474.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06631a403c---42510384769.pdf
    • https://betenenergy.com/sites/default/files/file/60742709351.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9a4f2891---xomogibumaranagisixelofe.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/27180501174.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f021d1b245d---65972191660.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/tirugirivag.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3958273ebe---20343558753.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=expressed+powers+of+the+executive+branch
    • 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_off0000f084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
font_01_sfnt_off00010896.bin
7a5b6a5068babe90ba1cdf8abf6e8582fe8807cf9f973a414cdec483dcaacb1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 17236 bytes
font_02_sfnt_off000134d3.bin
178c1a2eb040218d5e78718ae2cf9d8835990ec03b78b0c9e31dce33bd7e8b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 11148 bytes