Malicious PDF — malware analysis report

Static analysis result for SHA-256 842d2b215081dea4…

MALICIOUS

PDF

85.0 KB Created: 2021-08-18 11:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f5194a60144bd7cf596d0bee68a3c10 SHA-1: 8ea1108110e18a61f23d57acad3949adfaeb915b SHA-256: 842d2b215081dea423ca93f41baf58d6bf2f6ac24d2a74d9e5dbf64c04ac2b7b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable domains, indicating a link farm designed to distribute malicious content. The presence of these links and the overall detection suggest the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://phukhoabacninh.com/images/files/lojufagivonimuwe.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/dff4ae4c3271355f1adad2e217ab4189/minedon.pdfIn PDF document text
    • http://jljemc.com/upload/files/nidunatakinob.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210809124144.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dll5qgb5f3g178s884nbprmok3/getelenab.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/fenisazusosorujaremof.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/77256356673.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/50356766057.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/vuvebitadufeduf.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/vadofameniziju.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/rizaxagawajamumujajok.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zadogukevezeka.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0a23fab375c9796c4a96a7a9a76124eb/23387246651.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/sotavoxojulexi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d1f40334762924d69de27347532e70e2/mujenesovolodedamovab.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/67de6608d8ae978a228d281a56c5395f/silogosedezabozasegomel.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/motovat.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b4c9ea590c88c23de856eb64cd726ae1/mogawusedage.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1dk1j1bso6m4thhq4ee8jpses7/zununelafaxovalikemug.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/93003417584.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/36862d9d1db6ccca759141a75315c3d3/kasebopamulumuma.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/17386055334.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/lolevage.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/54349828562.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/m6jvh4fj82oerdqsv0vodcdt5f/11445013427.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/dejizop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+reset+a+mini+jamboxPDF 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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 17136 bytes
SHA-256: 10cd6ece1dc2947425aadded9b27cb481540e43e843136513a8efe66f97e4947
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 11024 bytes
SHA-256: 6f093e6377bd9506bb06c3dd1fed98cc1aeac527f55e361ab406baa6cc7dab8c

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