Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87d35ace5288629…

MALICIOUS

PDF

135.1 KB Created: 2021-08-02 01:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff026b303d8f55fcff7d6361bd906133 SHA-1: d59fc2c75c4336984e830af53b70f9872207f1f0 SHA-256: a87d35ace5288629de4f2d5a882fe4d0410417249e0d57e8979b343ad6f5c9d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=what+is+the+tone+of+the+gift+of+the+magi PDF link annotation
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d771ce3b38fe5d0472ed227716cf3f16/61732686415.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/7488577445.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160daee07e71ef---kelotajanenuwi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083358862f8c---kilodugisewenuwanufix.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/dikesuwajigunimuwuw.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/zugodiruvuvuwoxujamafev.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc5f22938---bifudetasaxerudazitiwilib.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/raxipedusivedidakode.pdfIn PDF document text
    • http://effekt-film.de/files/file/muvigexowepaxefazawoged.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/tiniwitolidodogevivut.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/sodajekulaloxu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985331065ed---52608002031.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/najas.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/36h5pbhmoiviurn7s1r05t0mr1/30864193819.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tihfk59vpr04jihddgt2jm2del/39379645014.pdfIn PDF document text
    • http://hkalc.com/userfiles/83916714752.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nahv6ie60a0maf6v4k6cs3p1hb/87048333036.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/kupomuxugifiruv.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/88077289832.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/55917347842.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_off0001b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA77 17320 bytes
SHA-256: 59c6189e52d51473eac998486c999640d4c72c7902225640db60111bed098bc5
font_02_sfnt_off0001f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7C1 10508 bytes
SHA-256: 2d57864976bc6f430d50cc56b6da661041ac83a291af0c58605747ca135f22f1

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