Malicious PDF — malware analysis report

Static analysis result for SHA-256 3894fcabe4f0288a…

MALICIOUS

PDF

86.5 KB Created: 2021-07-18 15:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c0b6e76a2a6d6b2cb70ad88d2cb21c0 SHA-1: 7f74ee8d7b346132244789e602d85d3c5688f808 SHA-256: 3894fcabe4f0288af48dc6d23a1da3471c6e1b86ab84d8b76e102da4d079abfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, which in turn host other PDF files. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbafa1c685---66360399192.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/efab357dc02facd5b66194f8d96d3a17/24758826433.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c990055bf7---fisidufepikugumubiwegapa.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/9198011601.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b29dc80690f454b8142cbe2151f564de/11190149014.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb130be12---zeraduxezitulobatuleri.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/sulemopijoleta.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84a3acfa9c---59931194084.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/sagorizefiwukugoniwadi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2838d59b1---488289544.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842b52ec4c---fikogeluvoxosaxemej.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/puzijejozuf.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/76645162122.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb8e3fdabe25b164d5f99276d27dd19d/zutubolorutal.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5tn6p3v1ub0d8t2sp1u2t5mlj1/72952708510.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d38e47e757393ad65786692fc486daad/revusekapugiza.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21437dc208---37071601193.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4feb4730c343255c5768ddb2d794eff3/59080013454.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab3f9abd4---43649519950.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/400938364c080428723cfe49555a7a92/15838268092.pdfIn PDF document text
    • https://arerp.kr/data/file///43162901026.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/nokesipenidaxiwunotabuvut.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c884d8c28d2---41771677099.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/16713249131.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/buveromabexejetuxisa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7a00d014ea6cb8e200c2726f24e3c24f/32907637880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=busta+rhymes+touch+it+mp3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 18048 bytes
SHA-256: 476b00e554afcfca60e917e41edefe96f76d8a33b6ab6a5de768d0529884aa09
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 16288 bytes
SHA-256: ae13349a3bd1c65b0614e2f1c25b31e9835276e366a7ed31bfe418959fd2f628
font_03_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 10928 bytes
SHA-256: 4382e08ca15a98535e4108508f337bff9f450e72993f302d5ceb363645cf86f8

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