Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e5474de94255c7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 14:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d353733681e6db4b90f642b4c3b6617 SHA-1: eeeec6c92240cf9061bd2670b2593dc296e40736 SHA-256: c0e5474de94255c7679905eef4047b9cffa2ad615c3418940423d652f0ac31bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS upload storage, suggesting it's used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://taxfirma.com/userfiles/file/zorajokumokarewipuda.pdf
    • http://managhantasala.net/mailuserfiles/file/lebeve.pdf
    • https://wct.goldcrownresort.com/magazine_files/files/5769372937.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7f37d4e5---gulomepubogapinav.pdf
    • http://el-master.ru/userfiles/file/71928100572.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/53228079976.pdf
    • http://studiotravenzolo.it/userfiles/files/23386303286.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/manidowo.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615587cd823e6---kekisikimumasijizolokipaz.pdf
    • http://venkateshservices.com/uploads/misalepaner.pdf
    • https://resicolor.com/upload/files/58390471574.pdf
    • https://padservhosting.com/userfiles/file/5508862572.pdf
    • http://sanchariglobal.com/userfiles/file/sevaxegetutumovav.pdf
    • http://etabetasurvey.com/userfiles/files/54705257352.pdf
    • http://neodentpetrosino.it/userfiles/files/biwaresudinag.pdf
    • http://daechienglishpark.com/ckfinder/userfiles/files/lematop.pdf
    • https://stef-nancy.fr/upload/document/45067130020.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/kenositawufozidonibodir.pdf
    • http://teifsepahan.com/files/file/79707557857.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/pujixuvagekefapupefuke.pdf
    • http://wskinbody.com/data/boardData/files/nipunerotobawulemutezulo.pdf
    • https://detmers-kontejner.hr/files/vagukevufojabowif.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/36926574689.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0bojp5apcorhqa6a0f3scpi467/12208601769.pdf
    • https://duongthuy.net/userfiles/file/sujefesijupawanefiru.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161383fa668000---zatibilexonipizemuvobev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=card+number+and+cvv2+generator
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b540.bin
8e3fc836891d6d67979d6bf83500aa9be567122f4ca970d9ee157010a8498b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB540 14644 bytes
font_01_sfnt_off0000da32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 16792 bytes
font_02_sfnt_off0000f249.bin
20db3259305c85c60dc4e423defe4353f3447a971d5e1614656898582704bce4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10864 bytes