Malicious PDF — malware analysis report

Static analysis result for SHA-256 d038fa45370e641b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 11:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bdb8186e1f97a5f299f486117452f7c SHA-1: 34d1b0c786f61e25934ff78dbcf80773f84799f4 SHA-256: d038fa45370e641b663dd1f11bb51d677ccdda8e61766812eaadbc8dc235ae97
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised CMS uploads or disposable hosting, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drinkpoint.com/uploads/files/90397547813.pdf In PDF document text
    • https://agatanorek.com/files/file/wuwesufusomisirejus.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/74375945913.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/25394118956.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/18291301706.pdfIn PDF document text
    • http://tdbm.vn/upload/files/litabigufotunakifidolom.pdfIn PDF document text
    • http://klpa.net/userData/board/file/varubevofuxedifamigek.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/70050226087.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/40754756515.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/rukubivamirawifoges.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s1pmljjnhk5phe4hamuft5r8gh/39613612316.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/171a55f95731477101db01066262a547/65630970027.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/lijoxenumalerepilizos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2541accb87---xewuvekabiret.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/rolopuwumivujasewobuk.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hb97taak618gpae4bm3ssdvv1d/tegepazutepubidagizikuzem.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/34754987828.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/nufikakopefivawakon.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/vesabumitelom.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/42699226548.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f64fe9f3cfb5cde2b62efadd4fbc07d8/nefozetosada.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/94274825143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=unit+2+uniform+acceleration+worksheet+6PDF 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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 11172 bytes
SHA-256: b747ac012d841313a1ee49b75ac23faced160056decbb0f4cbd17c80ad195931
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 16856 bytes
SHA-256: 9244d592ce7addeee2f888553889088e5b0a629e3df9a94e65fb88681409b7b9
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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