Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a185752662359…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 08:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1a74c24d9ad58f4ce81f11f00362afb SHA-1: 65868251f82c0a78a48d52b35b08f20cdd25eb43 SHA-256: 3f8a18575266235962c21d6a3d8f019d9e15429c504b49350ffac34a10cc849c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and heuristic firings indicate this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a redirection mechanism, potentially leveraging JavaScript within the PDF to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.1569

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=definition+for+disarray PDF link annotation
    • http://1hozain.ru/files/userfiles/files/simuxapoluwekipugijaxigaw.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/66278700615.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1c923cd712b4400a5b95b9da54fe60e1/84584178202.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080eec387eb8---pusubudonokesavuwobaxo.pdfIn PDF document text
    • http://technocom.pl/editor/file/sojerokivaluwixekena.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/23006752677.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/17823107498.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/64929446323.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/241557165369.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/88050422374.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/99752507442.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xibajuvarujofumakonuxa.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30deb52373---70891387279.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/abb5cce1c0f3d46b83023ec545ca3268/53729981689.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/pebimuxomolozaxikewutad.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/58922687959.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/35065429570.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/jogevuka.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/ribowod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/mubalutil.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ef2e2ee0---89503082484.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/sumudagolomilupudoku.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf836d90f0---felifetuju.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6af95aa74---loboxarivukep.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/deribabiwevaja.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/42372772310.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tejerumesiwole.pdfIn 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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 20392 bytes
SHA-256: 7c1f2a0d654c72ab0e6d4548cfffd49b17236ac96d470b49eed3600bad60a259
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10416 bytes
SHA-256: c9f32a4bd5ecae00225e992786ae1f509a173436d1b4fb64963bcf8fa3e78cf1
font_02_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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