Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0555105faf7298…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 07:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 026d7643451030ece451140a98afe902 SHA-1: 2b8aa9c42aefe21ec6d2c2287f886b9d84c7af55 SHA-256: dc0555105faf7298a3a1a4356c4d75132c728ee923c4deb4587a46a0918043cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the presence of 'cmd.com' in the document text suggests potential command execution, and the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://stcc-sa.com/motakamel/Ups/files/27206988475.pdf In PDF document text
    • http://climacom.eu/userfiles/files/zifofopaf.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/80662811757.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/80157044027.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a0ii98fq6d7qp8u934ms2e7qm0/95415760942.pdfIn PDF document text
    • http://rem-proekt.com/f/file/wakafab.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/99770137862.pdfIn PDF document text
    • http://qdcmd.com/data/files/50497527070.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36857278366.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/22894673759.pdfIn macro / runtime command snippet
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139602f009e4---lejumutekokozitanej.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/xotekimenivekobugebivozo.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/dikonurokejolotis.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/52183669135.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed0a73820---velukuvusoz.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/kevex.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bumodabodagemonag.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/pojogukojusoroxenesujux.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xuladobotu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36809471148.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/46605997967.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/65965310020.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/wirefajodijifobegogulo.pdfIn PDF document text
    • https://faresaldabbous.coIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vmuslim+mod+apkPDF 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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 10280 bytes
SHA-256: 3479032683da6fc6a83e6d7f0572288be3d0846e957b26bae35136410bfe6a94
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 19468 bytes
SHA-256: aa48803013d55d23d85caf34ac2d41828e81b1030698f043a590f0ac897b600b

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