Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaa1b56dfeea8f1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: deb971dd2b4c7b68fd13c5a5da88927b SHA-1: b7b267331ae13db39665b149fd467f9eef892b63 SHA-256: beaa1b56dfeea8f19d7601afcd271578f7803c3e65013ce78e6fbb99b63a546c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination by using numerous links on potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=quotation+cover+letter+pdf PDF link annotation
    • https://citronixdeflection.com/nbloom/fckuploads/file/dakuxobafitidiputew.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/nuvikukonovofu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/86078179533.pdfIn PDF document text
    • https://fallsplat.se/file/zolawadugabazapuzipisinu.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7f94e0d2b585a8b305a603f0c3e3f53e/ronipumizedolijotuvafug.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/63605547656.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/80776990648.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/nexosajoduxiwugatujukes.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/46197297840.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/bilarirafam.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b367a71a1b9---jasunubazugut.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c790cc8be96ffb4f5029a34420cdab7e/60928540059.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/wexupapemowamegi.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/87061183543.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ae191f8ee4b43c03c9b1772727befce3/11137409475.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/zubisukajugegebes.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/8797172211.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/90347343392.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/50942424522.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90578d767---68735384004.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/pakagitokavojixenowuli.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/82108056871.pdfIn PDF document text
    • 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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10668 bytes
SHA-256: b252e36fd3603a14e4e13812d7bc2de196897445d746c34c07f7aa059c9efe4a
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 18108 bytes
SHA-256: 28e03fe2029dc4d0f0ba66cd4e8305d511ae3685801732ebe8cff9d077c03dc6

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