Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7ac9759ece68a5…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 17:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a2177b9fa79482edd9e2d9102388993 SHA-1: 03de8c5829890ada1ec2cc87573cfc2e37b8abd5 SHA-256: 1c7ac9759ece68a5137cccab3bb9bc1254f33ebebcae2493216ca236482d4df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://krisoc.ru/uplcv?utm_term=milk+questions+and+answers PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/343fa20eacdb57328ca282b723a38367/vasiwokubawupadapibonajo.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/64099570094.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780e2272a29---zolekevosariva.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/61033062326.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/35be5d66fc2e3ff1c3dd0761317e5671/dabibijopolovapewovimogud.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2714bd8b09---wanineku.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/be9e95c0794d83e9d0f4b662ed4173ed/95541649553.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160882577a4510---50271843477.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6849eb13---23346448410.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/71521789405.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff8bc5f8bd---kixoko.pdfIn PDF document text
    • http://camwater.org/media/files/59901715551.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900609c1356---96428699950.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078554be729b---bobesitiragulo.pdfIn PDF document text
    • https://grandmake.com/userfiles/pivazubafida.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/62354131121.pdfIn PDF document text
    • http://findplusltd.com/file/35681865043.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/udpo5pumk4k3hhbm7s41fnqj0o/xidozavar.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/80993280443.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/92otbaugno58c31uvf9bd6lonj/lazikavotudolaf.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15a16089b---51713041738.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/nesimotilunuwitu.pdfIn PDF document text
    • https://aashianarealty.com/file/15681663765.pdfIn PDF document text
    • http://axwelindia.com/uploads/10693947671.pdfIn PDF document text
    • https://bor-diing.com/upload/files/38926587663.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_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 17676 bytes
SHA-256: 0809ff46ce765f1a5c75a4da7df7c46107fb11bf80c5257a38b577d1e378408a
font_01_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 10656 bytes
SHA-256: 8327060f61b63099d96ec56a120fd9c8941a6c198ca41e2251d348aa33d73d9f

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