Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7527cb52846c17…

MALICIOUS

PDF

77.2 KB Created: 2021-07-24 20:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9cea4fc7ba91ba1c045ea082c811e81 SHA-1: b5bd94be97b2319d6b18b94bdf7c1151997067b8 SHA-256: 9d7527cb52846c17381c3f8d8a5532fcb65063208c80606a09967261db6e1c47
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm on compromised or disposable hosting. The embedded URLs, such as http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/16931305974.pdf, are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0674f1b09---muvexuse.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7vi3h52e6la544re1fn18o7qb8/venofewejosokijugo.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dbf990fe---kedovotapu.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db011638e3a---tetinub.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/16931305974.pdf
    • http://lab4050.com/upload/editor/file/vipoj.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e544382e---bezakonasaxiruluketem.pdf
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/23197344095.pdf
    • https://hashtag.school/userfiles/file/bugiwufalinotiwitesofum.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0ad4f1def13cc21759dc7f23bf3b63d6/92282915647.pdf
    • http://adams-gold.ru/archive/image/file/bezewat.pdf
    • https://advantagelic.com/singhania/downloads/file/likowepiforokamewozoxif.pdf
    • https://mudraconsultancy.com/uploads/files/75803825164.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/resasalowuvipepe.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2c57c48145f31e0bb1778de915d733d3/pijaveduja.pdf
    • https://mimpishio2.net/contents//files/59225107102.pdf
    • https://dynasty888.com/image/files/20210623_002252.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/191rf4cb366e4fn3me2o56gbg0/98397020052.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd8b7f76f---95480834544.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d42697f0---76533413345.pdf
    • https://okinawa4d.com/contents//files/19198360694.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c954a14a9f5---jejukujo.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c4cbc272e---xamuwozitekipe.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee31c5ee111---99893002510.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc2929412c---juxuvadurupaguveso.pdf
    • https://castel.ro/userfiles/file/dunozupozavifepexetipeb.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ff61fdb1---42439875427.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=centrifugal+compressor+design+and+performance+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 16792 bytes
font_01_sfnt_off0000e298.bin
e0da37c90eb9c9a39676b0ae5a6f0f109f2deea665a49ea53bb7e487c07d7ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 16476 bytes
font_02_sfnt_off00010cdb.bin
adea2a7aceeb733b11d22678b38857cd452b9076538ade5e904cc71ebfa81d63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 11092 bytes