Malicious PDF — malware analysis report

Static analysis result for SHA-256 527387ec4d459b4a…

MALICIOUS

PDF

88.8 KB Created: 2021-09-04 23:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e0d362885838c8ec076eabd1c751285 SHA-1: dce80dbf850a140a56d1009fc6c45030ae5967e8 SHA-256: 527387ec4d459b4a78d5991d1f134f40325e89e2e8709f553d57dff2993e0578
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs hosted on compromised websites, likely intended to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084157fb8349---wunolawigipodopelisonotu.pdf In PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/9985183183.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/lezizepulikararomulelavuz.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f481fc79a8d---gulolajipaxu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/43665649602.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/83106630197.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771739addb5---tudumodafefefamukopajejuz.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e6g68u4fsv31fmu44loh1s3u3b/pokuvaboxezawujobemovikig.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/75800727119.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38289755700.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/gijapidulexapeleveku.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/foxera.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jukajilux.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/kakubufofuzijemewisilup.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/42028587950.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/62725899270.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596d06d444---98482667142.pdfIn PDF document text
    • https://bor-diing.com/upload/files/pazizagojizimawaxesewenim.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210602_EE1484FD82933334.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/12e4ccf80d1f57ad1f57d948bebcfaaa/26807817357.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kefikebaniwawoxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7a9e0a7f1---doliwobamome.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/kejepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=indicators+chemistry+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_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 10904 bytes
SHA-256: 3b9decfe9d9aac3252d4f49c14419a31c964896dde536f8e6032869b72d07436
font_02_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 17440 bytes
SHA-256: 922250fd76107d87f02f9451b92d4c4a3f8542332f6819a8543e2ca28c9ef57c

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