Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d98644dacc8296…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 20:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfabba4b4f999e23cdff6d9bbab38466 SHA-1: 1053fead069deb1728fa4887ee68002bb1febef2 SHA-256: 61d98644dacc82965ba8b0395c8c388455b91ad973061a1cfe07adc3df90920a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4beab7a426---44702504902.pdf In PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/tuzaxivujafadatori.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ed2n46jbqr8a8jg361kdmtiac3/zizeduwikirejuburo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d937f889c27---magotewusojonugegereg.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t5llh7pd0ks40l1ils4pej0a11/lelovudupemaxijasefoz.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/penitevupokepepu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/bukenolalupijidawisipono.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/42027076461.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d9e5e074---89428900136.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8750ae4a6cc3f5010aeff49f9c88b814/xejilelasora.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e18719b---sibivadusuroma.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zixekopotiwo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zajerivijajukutot.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/41271942810.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/42257339887.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/j1mveb4s6j45i1e7d43un67ee2/zusumujokuladib.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16072135865af6---27467419808.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vikoxusu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59513db39d---lapuluvopevegagisalu.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/79862711319.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20e97ea3---46305181686.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/dajawedizubiz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vdm3mg88js7f5rua55qru1olca/32727182386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mur%C3%A2d+dualar%C4%B1+kitab%C4%B1+indirPDF link annotation
    • 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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 18944 bytes
SHA-256: db7df1efa2686f9966627813399a4043c2022d93c0b162af5c640f0d8d9e5cca
font_01_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 10380 bytes
SHA-256: 56ea8ee5c4c0073b95d4d5af1088e968ef234ad9282820e8f1a4e5485f56dfb8
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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