Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6053ee5a177b203…

MALICIOUS

PDF

86.3 KB Created: 2021-08-09 09:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a07d37ecdf446c763f0114de190d326 SHA-1: 8998e43e442828238dd0c0b9c19f997b0bc26920 SHA-256: a6053ee5a177b20383f7366448ea5dbe16af34e5eb844bec93889e113fdf1bc4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme, leveraging compromised websites to host further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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 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 http://hodori247.com/uploads/files/70917365870.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/v3ige566g6c6eo63pu12o3bu23/werijenudararipitawiku.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7756384b6f---60236335021.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/chcg0hm5q4p8oaeqd0bbq0fj73/ruvikeranimanowijuni.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a861802b88f---refomidubejinep.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rokezavikatifipelubevinet.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c365b173877---26556962148.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bojidokir.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/71944722061.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/52502700494.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28056b356---85027099195.pdfIn PDF document text
    • https://actor-conseil.com/files/file/61949276376.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2fe747b7417368fc42a9652469960935/30881689782.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc51106fe0---13844229407.pdfIn PDF document text
    • http://prosquash.by/data/76031114361.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824382eed85---43502375053.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf99059629---zuzesopobuzijubik.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c33255c747bcf51a1ca5ac91d2a6ec8a/tenirububebimefokavuzunaw.pdfIn PDF document text
    • http://tianfonmm.com/d/files/74804491344.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/finirepixe.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/80833090296.pdfIn PDF document text
    • http://coffee33.ru/archive/file/25080011903.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/75057818231.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b09d6c96503903bebb459168f7678a9f/kalojagekalasena.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ta250hrm55kipd5neiqv0r6gg1/96694739597.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3625db53---4666454552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bolt+hindi+dubbed+movie+download+480p+filmyzillaPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/69322812526.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_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 11524 bytes
SHA-256: 5adbc77600f5b17d08e811dd86da6c69fd1c722f91c29957c9f4be1705433587
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 17392 bytes
SHA-256: 71a89493b0a2b2055909b234099c10ac2f17ad46561119af29ffb160b4cbaed1