Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc913b5e95c3e6d…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 07:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1077f50e40c52fb57ac14e537ab8bd2a SHA-1: 1d817e565fed78c01374c5380d8632c640a554ba SHA-256: 1dc913b5e95c3e6daf7d12052c65485dcdbd46b6acf0cd73891cfc5e53cb6ab0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or scam lure. The presence of an IP address literal in a URI further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jshtextile.com/UserFiles/file///74621961731.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046d67ac189---wofanegikabag.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/naborekazojas.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/mamavavurutidazanajin.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e600181e560---81938763372.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/50139980375.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/63138102614.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vevofarupezipil.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774db371e10---givuxaxokozujaw.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zidemoxirarugisufugux.pdfIn PDF document text
    • https://doitoutdoorz.com/file/4WcmBnCCnZ0R41dA.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/95194340413.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/f087636bc29ea48bcb17d1652c57254e/83340546144.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/kafapubimetabufabufe.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/92905041211.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/panagemaxavuwamukasajivim.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83856097603.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7e30b572iffk01525eadavrj60/mosaredetuf.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/jutolesawuvapewuzirisol.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/36196666956.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/41350413610.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216715813905.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160cce9bc1e112---98845094991.pdfPDF link annotation
    • http://sierrahighalumni.com/clients/878712/File/jamezuz.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/6045084786.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16097a69acc882---duziperuridenuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+conduct+a+fishbowl+discussionPDF 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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 10656 bytes
SHA-256: 453cc12cd7169e4d0fc440d93560a7cc3f3099ac212f845b6680ac1d844577a8
font_01_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 16644 bytes
SHA-256: f3baa05e4557766db41b180d497c8db9ed7cde41828103c128d91722cc1cf4af
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1