Malicious PDF — malware analysis report

Static analysis result for SHA-256 88989d316a330bef…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 07:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db7df2b63ebc54621eb184d388fabc63 SHA-1: b15aefa989bba7e1b32dd84e4bcbc7b46eaf2eb5 SHA-256: 88989d316a330bef8db51703d764808ec954311c2a501aea205156ed65250a09
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised CMS upload storage, suggesting it is part of a phishing campaign. The presence of urgency lures and callback phishing indicators further supports this assessment. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=early+cancellation+fee
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d061eba83b5---mizuwovugunofezumolidewa.pdf
    • http://airconbank.com/upload/fckeditor/file/jopomiduwi.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfe06c306f---migoxedewonagadil.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/11086777215.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/bk9fpoviaverpevulvhql9j5oe/99680317305.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3876d04ee50396ecc939c46bf78b3e97/73763688847.pdf
    • http://seyrimerdin.com/userfiles/file/bowepiwafemomana.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5ea681e1---676398989.pdf
    • http://anthonyvienna.com/sites/default/files/file/falamowulofivewavowelog.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2e63c882---78736529305.pdf
    • http://m2m2design.com/userfiles/29223625936.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b27a6659c---33129786860.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lh7u6qlkkm0l6u30khdf7n4eun/36698590951.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca8a4056---razawero.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/321jcg15edafonhbikrk617pn9/78077280236.pdf
    • https://press-centr.com/images/file/90626083642.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73df8bd92---10073075356.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071341b6404f---82523266082.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/08b5d83367dfc46c96258aef08cd0e1e/15514976604.pdf
    • http://vasamo.org/pds/userfiles/files/ledogokevud.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/79f7da674326a4577c2c75a14f33ea9b/jovupawomakuviwi.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a34806d9ed1---lifufowaregibajisolut.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160947b4caac98---45354592036.pdf
    • 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_off0000edf4.bin
fa53f33af94a8da784a7d5950babfa45b0aaa9425dee3a09ecec769fa1607415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 10260 bytes
font_01_sfnt_off0001052b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 16792 bytes
font_02_sfnt_off00011d3d.bin
039e64586a08362b6ae4eb7a15ca527187dc2ba1784f5fb142bb86d0a2765a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 17524 bytes

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