Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2eb6fcbc1f2364…

MALICIOUS

PDF

73.6 KB Created: 2021-07-15 20:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 042cbedbcf119bbdc003709d0b67ca73 SHA-1: aa6ced58510fba98a6f1f83ac46baf9980876a4c SHA-256: 3c2eb6fcbc1f236482c725d597942f9088fb4351e36992fd68e36725c2b2da9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=excise+office+phone+number PDF link annotation
    • https://stomatoloska-ordinacija-rijeka.com/files/27622413623.pdfIn PDF document text
    • http://huiking.cn/uploads/file/271223552498.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7p6nnfrcr18rkkupgamh6vr7un/sopudogavavogibesomivamis.pdfIn PDF document text
    • http://thedreams.cz/files/woxisumoranewisugibisoki.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/42748068047.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4mq2gm7b7i328bpevqs6regv36/dokagedijar.pdfIn PDF document text
    • http://haki.vn/uploads/files/jijetupe.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/49267812489.pdfIn PDF document text
    • https://ancoraeducacion.com/images/nogejajivotazokekipanog.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/50087622005.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/jamepusajoba.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/sugemumenosivibagizapum.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/73982863890.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pexemise.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/86670916166.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57d22a415---getamelebovawariferini.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/88908528227.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb7a53d05---lobagi.pdfIn PDF document text
    • https://slide-bearing.com/d/files/80861486620.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/38323765786.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/75498956681.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874401a53b7---kepivekizab.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/minujikivovo.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/04947ba8d8792790c3b21e8c7043d8fc/91297490982.pdfIn PDF document text
    • 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_off0000be14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16552 bytes
SHA-256: aef3a855f457491eb0cda6afec03cfaeaddc5456af1de3c13d0800f503b468be
font_02_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 10764 bytes
SHA-256: c498f18dc257e5bd44b4bab691d424e0617a1aa52eed0c51ee1d657f301dd6e6

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