Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f44d1041e86e9f…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 20:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b39c9dbac7fcce1312c070f8489f8d75 SHA-1: 03bb46f317aba1d7849fbe4f212a53d1e7caef0c SHA-256: 04f44d1041e86e9fcfe92f86d3022416296cb52608051e7bf5b654b86616a986
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://uceng.net/_UploadFile/Images/file/revixulurug.pdf
    • https://detectiveoffice.net/userfiles/file/43190520425.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/76q9t6t2tc6cq7tflfbmqotfk2/95850155088.pdf
    • http://cbgnfinance.com/userfiles/file/64206851669.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/108bca35f08ab91d4fc12bdda0b0a212/rimaregunokaridokoz.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e46290334---4530554328.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7d44c7e8b77853e01241685985079ea4/bitatabikevijuwur.pdf
    • http://ruoumoc.com/upload/files/11543165303.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/f3b0ad38609d2c540604cd37f14ff019/85335830451.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tf98dsrpik5vfqfm8rere8nmj3/2106344977.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t4lf8fd97fpvupu2tke89gbqvd/52741538313.pdf
    • http://skrabl.pl/www/rpbd/fck/file/pudovofusobibolamoti.pdf
    • http://urduhadith.org/survey/userfiles/files/nofuxigenufus.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b126aa3400e---jamaxirusu.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c498b14bf69bac60f31d11548f08484c/zepozobowubo.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087311a370e2---xuxereze.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/df79dfbb83fbd09668448e1446a233f7/26914856922.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa134cc3cad---netitezife.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9843bee28a898e4e13edeada7706b3c5/23807587134.pdf
    • http://alpha-cp.com/userfiles/file/zagoputotuxovogubile.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/aiqjbkrjssme54n3oq8pgmu2c9/nujowon.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4aff148c---7075860172.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bkpro8voinijnh3kkhu7nssbgf/gitunusaregulula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=first+menstrual+period+for+dogs
    • 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_off0000e70d.bin
9f51f7034fb224c0374e09b6e8ced8421661e97a2cb6bcd06cc59655c55fb734
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 16616 bytes
font_01_sfnt_off000111eb.bin
d77e0197326c038f249b47638e4b9c0164d92ba6516e3d2c8e9441d876e91d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 10920 bytes
font_02_sfnt_off00012af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes