Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1ad1585eeaa545…

MALICIOUS

PDF

117.1 KB Created: 2021-09-07 04:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43dda96e06d5da2f9c0b9bd53d9b6551 SHA-1: 1c166ec27320f7346e88e01e32857369bcf7f3cb SHA-256: 5d1ad1585eeaa545c8452aa22ae2e128a0b280c436aaa36ad218ae218fb91662
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users away from the current document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c52bc360ff1---gidorusoliwos.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1dbd782a8---16890974310.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/12442224406.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/futavuvutolepokuloj.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///37764595803.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4bcd7b37---98031254863.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/39100346645.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9cacd1f9c4b582dddd238c30a4a8fee6/38415153513.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6593906ed1---nerigisi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3b500d5d781fc25912b4857e03569ef4/28779154447.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/24841733442.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/livamajisukirelusisizal.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5992b45135---bifejelaweludutofod.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/rudagojekoxep.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/34186427472.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/daxebimapijixiwisu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/04c3766f437cbc1a8f866f7a7c30f19f/ramumudevi.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/57880813659.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c3ba620d---90646311604.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/neguru.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/24290133139.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/71752824809.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102beb1f3904---nafibogajinurogazam.pdfIn PDF document text
    • http://mfahk.com/upload/files/bigoto.pdfIn PDF document text
    • http://www.toptehnik.si/images/46634605803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ontologia+epistemologia+y+metodologia+pdfPDF 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_off000163e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E1 20676 bytes
SHA-256: 4a39d2041ca8c6dbb5ef1b55b4c65e47fa3c6542c48cba183def42d3fd2b647b
font_01_sfnt_off000194ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194EE 10880 bytes
SHA-256: 1358987f275024109024d4688039ec0c7dc1e03120585de066049321374ba4e1
font_02_sfnt_off0001adf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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