Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4df7c1a0a30be5…

MALICIOUS

PDF

87.3 KB Created: 2021-07-26 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5b456dd7121c6077f20793afb71a166 SHA-1: 926af0a0997f04d7b41fab408dc76f94cd285182 SHA-256: fb4df7c1a0a30be522f5ce770184bbe836489f99e86bd9f0e27e4335737f96aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and attempts a password-protected archive handoff. This suggests the PDF is designed to trick users into downloading a malicious archive, likely containing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mobydick-band.de/fckdata/file/29745299560.pdf In PDF document text
    • http://campbellelectronics.com/uploads/39404985795.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/xodifotibepogijajukora.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76940705182.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc751fca61c---57736039964.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/80841470836.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d26fb38458b---xabiwav.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/70050963908.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/46802975415.pdfIn PDF document text
    • http://vejwun.cz/images/8902388501.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xuwoxexetezuwarerosugu.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/kelusovosewapetite.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/16615599490.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608177b9968c0---54180880658.pdfIn PDF document text
    • https://castel.ro/userfiles/file/69760209388.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/061e26e97c9f504fc5a616125390b717/zilotagodug.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33af440bb---xewanubowok.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2898040454---38535999958.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/45463808128.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/luwuvogewobenowi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9376317a---dojugefuribazegamonamam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984519220cf---20316193832.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nixeretogopineloxatus.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/92287962736.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/38860071616.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077631e8b60b---kanaresetorekiv.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e09abc89---pamojamuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=winrar+free+download+for+windows+7+32+bit+offline+installerPDF 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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17268 bytes
SHA-256: 11e6963c56229c10a386becda18aedf988ff3f6c07f738878a7d65f10b65c6ac
font_01_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10908 bytes
SHA-256: c11414034421631648181dc9a802276d3920b2b7dabcfef13987331e0af7cabf