Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f969f991b853a5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45fd7b8ad6adb0439edb60739755d05d SHA-1: 5e2453f5bfddbfb0945d63b2396878d8f1c51d9b SHA-256: 03f969f991b853a58022906c6ec5f62a8f6dc002a492ec718dbc37542b0ad3fe
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories, and includes a visual download button lure. The primary URL suggests a lure for downloading VPN software, indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=betternet+vpn+premium+apk+free+download PDF link annotation
    • http://innotec-industrie.be/userfiles/file/51937164178.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/70749908709.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/28085782253.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42a46b627---femujifejapovagegupu.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/12428363087.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/20526780667.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/79f01f81c4e253fe73698934b32de0e0/22845775042.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/57292789439.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/vanawomuwilag.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/kulaxilaborovanunan.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/vetajumozijazef.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/58145897223.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec1051978---nasujexebewowefedasov.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/11d2nrb4ph1fgae6ic8loa2pr0/dijuketirorobibis.pdfIn PDF document text
    • https://terracell.pt/images/file/pabebafixibinonobunexib.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/zetixixedu.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/lugejo.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/revexubosid.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/xokuparafafajifisiboz.pdfIn PDF document text
    • https://festacontinua.it/public/file/29242170725.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/16362836219.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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17752 bytes
SHA-256: 5db4ae3052165436e8a2efa4cccb109e4767cd2b9bfec2301cf215d95157068a
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10888 bytes
SHA-256: 938e04e1c5c7c54d0dd86fd800dc04464c64618c3a6a31c8a0ab700f9507ad3f
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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