Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6e6387cd82489d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 04:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df4dbacfb6aaafe5977492ab8fc9db33 SHA-1: b10c0720e73832cb281ee20eeb4abdd605df7955 SHA-256: 1f6e6387cd82489d29f74143d83d8d99f91daa09b6e2aebc7ded628570fb8330
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these link farms suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613799c53ce09---73173051443.pdf In PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/duvugugefidebofapika.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/8545946340.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090105114973499.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210905042853.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/51541914866.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/bixezidoligez.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab3c44126---bokuvukagewerupag.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141cbd52019f---nakelepitofikomowofaku.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f82431302---98930079566.pdfIn PDF document text
    • https://computerzone.pk/file/84130063929.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/19770538156.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-4/20210904064921352119.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/melopo.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/21589871673.pdfIn PDF document text
    • https://bursac.net/userfiles/file/76861066206.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/jejukegagabonofexiwulub.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/35877930449.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/nomovalarutafiluvu.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/46624070271.pdfIn PDF document text
    • http://krzeptowski.pl/file/88774002135.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/wifunug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+grand+theft+auto+apkPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10768 bytes
SHA-256: 83fcf0c2e77cc29dfea04353eb80f77c8ed07781c1ac4860734a49d190c04822
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 17396 bytes
SHA-256: 28e9feb7c064f09d2320ddaeca8bd30baafd7dd67fe58d424ab75dbd9ada4f24
font_02_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1