Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d2eb3dbcbdf23f…

MALICIOUS

PDF

90.4 KB Created: 2021-06-30 06:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa56cf0a99b63f26a15c5286e8029184 SHA-1: 97e1f0e1c5759f3c02611fd907f02e364b734080 SHA-256: d8d2eb3dbcbdf23f83c8854e3a2939e5cf6adb919b6d2ffecac33abe4cde7cac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://allytemp.ru/uplcv?utm_term=pdt+to+eastern
    • https://contabil-fiscal.ro/mm/file/nikabadodasitalen.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/32509082897.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c8963cb4d64457d7f1a77e08bb99def/mopuvanobepukedajag.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6291c3957f24e25637e6fa6e5107b1a4/damasukejawafogadoluvax.pdf
    • http://geasit.it/userfiles/files/26508565131.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52f88b172---96598744387.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kebogeroveda.pdf
    • https://lemanssrl.it/file/nolaxewejes.pdf
    • http://feach.ie/images/uploads/file/razedajivonawime.pdf
    • https://alakharia.com/public_html/userfiles/file/rovolilonolonidosunu.pdf
    • http://mispuntossaga.com/campannas/file/kipozipapememafatolag.pdf
    • https://adepotcustom.com/UploadFiles/file/20210514234338117.pdf
    • http://lyzebrno.cz/userfiles/file/tazupilopunokenurapud.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7a797a7fcb4e453264823206de033b18/38220836601.pdf
    • http://envigest.cz/upload/file/vipinaroredasotadi.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fd44e8e0a1e33be347fc98f1d7fe608d/12123268240.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5f9785a3b8476fd7285076aa9d0d65d1/17380880205.pdf
    • https://alihuata.com/userfiles/file/banifofonaxejuzop.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/rarefer.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db3ae112581---93120957397.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0b8e026cf776509686f764338dee01de/fosibera.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdfd99c540.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/lijoc7o831mspv78geupmqfk12/lujevikalakop.pdf
    • http://aaaexpressheating.com/userfiles/file/13912854314.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d849697f27---dujefatexonavapa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d2.bin
e7a37577ba2a30d0a21bb681a7b7576409f500daf7f552f2d697e0621792291c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 16400 bytes
font_01_sfnt_off0000fd59.bin
59e0029ae4e7136878b48932d9215029714ae566a149bdfa1f73f84ce9d71a49
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 17956 bytes
font_02_sfnt_off00012be3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 16792 bytes
font_03_sfnt_off000143fa.bin
dadfd56566d3e23c67dc87297178ae6371c028e77cb3d5f59990cb4817b8d2de
pdf-font-stream PDF embedded font (sfnt) at offset 0x143FA 10104 bytes