Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc35a3e1c579710…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 23:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac37b159ad474e6d03b73e9aaf726793 SHA-1: aa8c79a4ec20d73eb27b81c93f9f77586c2b64b2 SHA-256: 7dc35a3e1c579710f17f4703116cc73552177571faaabfe1bf643d1be9952dff
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nasikampung.info/contents/files/66471441345.pdf In PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/nugerokiduwofet.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/geziderekagaxim.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb1d287cd3---julimirisurojazuvi.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/nuxixarumesupuda.pdfIn PDF document text
    • https://arendic.cl/files/20666543527.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/7720940265.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/76444126105.pdfIn PDF document text
    • https://verner.lt/images/files/kawilemolaxitulavu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb45c5de---ferusibekixatasot.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/24962616846.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/94614388607.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kivituxawix.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/83384411346.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/fovuxix.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/wadorogijegodi.pdfIn PDF document text
    • https://bloomeng.com/uploads/tunujejonofunonitigitiku.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m2fadlrropv5pm0nd4pl1dvh86/90435411694.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/vuvatafimivebuwelagovawi.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/zajodulutexopitete.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/441165371.pdfIn PDF document text
    • http://nincity.de/inline/file/posipavorefujaro.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a83c5d2c615c5a2ca388c483b163f73c/rokun.pdfIn PDF document text
    • http://jawarakreasi.com/file/64271706941.pdfIn PDF document text
    • https://coevent.ru/upload/files/31492137425.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94755339981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=setup+hotspot+on+androidPDF 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 17724 bytes
SHA-256: d29972f7a0c2ba9ccdaef940835cd646e2b4cb7697feac6ad313ba9993380337
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10616 bytes
SHA-256: 2a41d65db435353e723fa3b9dbb4d62662b5fd24a0e18aaa3e9c5350398d53c7

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