Malicious PDF — malware analysis report

Static analysis result for SHA-256 75453836c3e12daa…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 14:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 26903fc2f348a5aa9e063db7c66d5220 SHA-1: ccfafbe315d32f99cdc8c23b76d851acefc9d15b SHA-256: 75453836c3e12daa8d4e04af5c701309c268174a6a030cf943f666f255ed2dbe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm and a callback lure, attempting to trick users into calling a phone number under the guise of a billing or security issue. While no scripts were extracted, the presence of numerous URLs, some hosted on compromised CMS uploads, suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://pspectr.ru/userfiles/file/1138795219.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7953f5a1466a863d53d7c952ebecf9cd/89533760774.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pomobobuvaxitipunape.pdfIn PDF document text
    • https://htchninc.com/d/files/vukatokabojukawip.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b7ac00afc33591813bcba4e969bcbd4d/11530066273.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/22543323242.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xudenilomi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c34dbf60f911cf7356d8d24a158f0eb/88251405564.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c4e8aa39---jenigitirak.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/suzumonigegoban.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/nelezikadinofixomoguzil.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ec6d17bfe7be26169b522ff7e7844626/xivibelalafefuzaxexir.pdfIn PDF document text
    • http://ashioke.com/images/library/File/renawijug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab7635ba9---natuvojugesiv.pdfIn PDF document text
    • http://giga.sk/storage/file/47707943305.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9omemr0kvamqqq4ufrhr9b5rt4/bodugepinepiso.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7d219c7c---5423271752.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/58713220745.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/74bf03734d29b219419ea9fc1dcb56da/murifugatuwosotibol.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb708db7e5---wezevoluw.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/83007389486.pdfIn PDF document text
    • https://hirurgija.me//files/53409547049.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/900d8b6657977963a5cc35a3635f6251/fatalikogulomemuxelugura.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mt91babkh12jlmbvh176s3h7h1/13334611031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+sort+laundry+by+colorPDF 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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10572 bytes
SHA-256: 3d27511cf8044b70059757b0b9fda4c925528bb87f253369995f45889d8636bb
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 17116 bytes
SHA-256: a1d063e74cd3bdca6c5dac40ddf4e54f3e9c9a650f63b5f99301745fdf172404
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.