Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff6e37fe700fdbb…

MALICIOUS

PDF

97.0 KB Created: 2021-09-04 01:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27f69924d77e0dcf52d4625fdb73b2b1 SHA-1: 8f8dfa59a93479583ab0a641379b1c8f7cab2c66 SHA-256: aff6e37fe700fdbb04a1130cd6cd7fd9ba6a56ec0a4f2b3cb4c1e0fa0504a78c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=anorexia+restrictiva+y+purgativa+pdf PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/27c75bddc8baab87d10105f70a864a8d/liladefezesopekosir.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/ginigixikabef.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b416d7df1e5---vokexemulujebe.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/domogarojuxugazupazeboxe.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/61a8abfe08b9c615a8a9ac0b98dfb98c/xovawisogoga.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/e9j5ddhplr9f638iu4pug80v3s/jodiweregadunarukazugaxa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b32e7adb---kugedotulowajaxuvoti.pdfIn PDF document text
    • https://arerp.kr/data/file///nidofuxofesigugofefadane.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/nowisunubojolo.pdfIn PDF document text
    • http://wixoon.hu/upload/file/lapive.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/27448853238.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/wavarupezuloxatujidikogat.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/zofoxonerajibizedokis.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210707130536.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/lazavutemunawa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7ed2b114a---natalez.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/99191373655.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/79103228612.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/19744980666.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/15630967958.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/1141135928.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b984a955dc81c931b0a76368f34624f7/nuxuzawiporeretabaw.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_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 18492 bytes
SHA-256: baac9c8577a2c588dd3d749a748fbea20b9877da4d9e988c81e77d85ca765447
font_01_sfnt_off00014488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9F 11112 bytes
SHA-256: de0cc6838ec9935896790617a26dca6a68e508b685bdd5d3ef582c9f9237ab2c

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