Malicious PDF — malware analysis report

Static analysis result for SHA-256 498a4d5991211bf2…

MALICIOUS

PDF

103.4 KB Created: 2021-07-19 00:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b6f5a42361d1cefaf91b9548a3a5067 SHA-1: 1fa3ab859d22f19d829f3c7bd4d0e10437edc618 SHA-256: 498a4d5991211bf2c98da2c22c01a22c6d8f47b634e54ae875444bc2d48a876e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware distribution attempt.

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 https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed5160996a---pariguwepodejawibokud.pdf In PDF document text
    • http://harc-ias.vn/Images_upload/files/88836175363.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/finomivaxoretonatinemile.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1a58a3e5---16359416155.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a678cac5801---23390038576.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/54145104051.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/vapemebapovafolarawozo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/69237033208.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4f21stjgf02ccie0afsaonej72/rininegakuzaligegera.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bb169e31f429a7b1c90e36ccbe6e1917/xolufexusav.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160989f0571291---vukadozibus.pdfIn PDF document text
    • http://charivne.info/images/file/xapukebitawolavevunige.pdfIn PDF document text
    • http://arslanemlak.come/file/pipexavivevimu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4876166c6---suwajubudu.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/49573771345.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/14c856ace343fa1c9426eda3ea52f31f/97330240334.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/20775689906.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae84632762f943b0f297e0b8f2db0163/saxorudipi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e6ca1aad---kaliw.pdfIn PDF document text
    • https://go2germany.ru/files/file/40608355094.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tujikasetexafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pascal%27s+wager+play+storePDF 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_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 17376 bytes
SHA-256: a776a95f4c0769337b394450beb99c0da84415deb5adcf62b0b968c28d277006
font_01_sfnt_off00015fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C3 10588 bytes
SHA-256: 00e56ce74e96eed867b19ba1628fd99061a9aaa0cc5cea0a250f1867973247e0

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