Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab98ea853f6d29a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 03:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9852bdb8137b53caed9fdc0350b8a91d SHA-1: fcc14b367d722add997da3be75dc5c0c44a32abb SHA-256: 4ab98ea853f6d29a4103427615badb7f18ca2264ed85e373797ed44214e9c7d2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ladulceseguros.ar/noticias/fckeditor/file/86407111934.pdf In PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodovabuwebidewow.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/kekopaduse.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jumixunudebidetasasizeb.pdfIn PDF document text
    • http://groupkaishan.com/d/files/tulojemegoned.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c19f475c06a69db9bff0502ec140513d/tugajobaxokubifugepidavak.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/balujaneperujora.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/76748532306.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/xalipulebabim.pdfIn PDF document text
    • https://agermag.ro/mm/file/sumategafefogixelupaxat.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/4377197672.pdfIn PDF document text
    • http://xycrusher.com/d/files/karune.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/90663049556.pdfIn PDF document text
    • http://zerosquareonline.com/file/8532872061.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6f7m8h5752dro4j8ojfs7q4704/digitav.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/mebodugeniliruxubumite.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vaprke3bnnsngrepubn77dipk2/rarezig.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/tejanigixapiwusiwen.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/72806898554.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d480315e28---27148303352.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e3fef7e4---79226092187.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/65957579853.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/59481bc89aef59eb642ad029c81bd8de/60454541426.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/vasonowizefuvomapi.pdfIn PDF document text
    • http://mobiliteit.nu/files/narezewazudufadudolijebap.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bafexefakewomasaxuroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=index+of+shameless+season+3PDF 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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10552 bytes
SHA-256: 85d0550123973c4a012476596a3b9f96d5e22dfb33aa41bff886311392dd6464
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 17436 bytes
SHA-256: 9e9101e8ba267c59949af276a3058c54f3258d9966cca2423c0b4ff2db341e33

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