Malicious PDF — malware analysis report

Static analysis result for SHA-256 e293d99b0cb0abc5…

MALICIOUS

PDF

80.8 KB Created: 2021-10-27 11:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c678a91c9b48ad1021588bea73d2803 SHA-1: 20db7171b40f3f8f59c9b70b55e0606905dbdff4 SHA-256: e293d99b0cb0abc54bebe20de4ba5bc5afef216553f054d58a179ad0b712235a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://akgoz.zemta.com/uploads/files/daluvedejikulokolo.pdf In PDF document text
    • https://ingatlansos.hu/images/userfiles/file/50826440252.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/govabum.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/gukajuxuwerobojife.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/71788118180.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/dilabegepuluwoveledif.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/90782869449.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/202a90e3bdced0a8056220947402db78/poruxe.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/diwepu.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/zegirufaxavojulijejonen.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/7802285455.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4adc6f3e3---munewezutovefixugafo.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011548199255.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/samufu.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/23259926093.pdfIn PDF document text
    • http://vucert.vn/uploads/files/62466590177.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/musosarukomunutufura.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/dazikozavawasukewawulave.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16173251da5f00---43676977728.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/45862877905.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/6245776986.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kinarotopavogoritasew.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/dijonadofojijevatumam.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/44572673745.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=hallelujah+salvation+and+glory+honor+and+power+he+is+wonderful+lyricsPDF 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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 17424 bytes
SHA-256: 8089e79bf8408069aeacb457570c198b7a845c03cc93f1d56be27d2a214a69ea
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 11384 bytes
SHA-256: 7fada2a7d22d40fab50b1a677b1847f3f82bd49984510d69881492030aaf6ed0
font_02_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1