Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bda6f760edbdf8…

MALICIOUS

PDF

86.4 KB Created: 2021-07-16 07:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 04a0457c1831ee4b8f111aa3d3419e0c SHA-1: 121c378021f45a9f685901edb8d465adc7f7e1fd SHA-256: 76bda6f760edbdf8fca7601ad202dbdf0e7e71804f3aae52567821ea2f401aac
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links, many hosted on potentially compromised sites, strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb4d76dc45---nefexivoxavireg.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091243412967---76464015208.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b0a3390c---todizipiletifovumidakud.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/63921321509.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/sibukifola.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b4e4c829---70042932597.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/3314193114.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/lisutezeleponotivo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/de439288196bbca82d074401c1015b33/26951306745.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/88615885830.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16224156968096.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/99786309231.pdfIn PDF document text
    • https://empresa-venta.hr/files/25905852085.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/46941342843.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/xinetigutowozejaked.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/72473634454.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f4adec8d4---17837375605.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210607142822716033.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a61657b4bec---verulekofabonugugepad.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0faa07f2---kidetamikunabotede.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/adfa97bf7162e8763ab0e4292612ec4d/luwisagosuxorivad.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10092181529.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf02c0c4f7---zekaxuwafejenu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a2cc1afc9f1f573921771b223ade3eaa/jizavodolulibavesuwu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/peo0nqs5ilce2uanit9v16sj82/waforisemupiram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=31+contender+for+sale+by+ownerPDF 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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10844 bytes
SHA-256: b9325fc50a3a66d57053affee9b57431e96c09fb782dc617445b677d57b4b9af
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 16756 bytes
SHA-256: 465eb6311e91265f2ae4e54cea0470c7a2130ec312e0204e65e5ce6af1ae4ba7

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