Malicious PDF — malware analysis report

Static analysis result for SHA-256 03689ad8f6e11e54…

MALICIOUS

PDF

71.7 KB Created: 2021-06-26 02:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbb364004948322f78cb4c8253a14a19 SHA-1: d409b2e60dd25e86d1c241acc9b1e187a062d662 SHA-256: 03689ad8f6e11e54cea3d536aaa440ee29936ce4704cdf2adddfc43ee0e4f3f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting PDF files. These links are likely used to distribute phishing content or download further malware. The presence of numerous distinct hosts and the use of formcraft plugin uploads suggest a coordinated effort to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40a3e485b---lodutoxuxuxifodunumiwo.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad3210210---legewagolazubururaf.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f43cf06a---pobanulemejogowe.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b97f1041ba97685f02f93236f3200f78/8786297526.pdf
    • https://1877painters.com/FCKeditor/file/xijevalafobawep.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c48ba626fa60492fc89e2f2f1a94d77/44923046382.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdd1416f9---tasemixugolerut.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071f66e1d1de---46420921518.pdf
    • https://nikosdimos.gr/userfiles/file/butegasoji.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99c24f1a3---todisipejejesifug.pdf
    • https://keluargamimpi2.com/contents//files/molixogedez.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vu8lq5joc0db9uaekn2g3i0edt/23377291125.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6ee4262cc---87549433687.pdf
    • http://asfalon.com/__files/file/89689927902.pdf
    • http://megat.pl/uploaded/fck_files/file/49290867743.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54af0df6bc---33583066259.pdf
    • https://annjulieskarpmo.com/userfiles/file/34171577373.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9ef10265a06f88c5d0fc2c398b24283d/fufowokoverapedazukudi.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba839d46453---sosomowinirojifewolofa.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/48fb3bceed7373fa7668c6b21e54efcd/99635630163.pdf
    • http://zonazero.es/userfiles/file/11525678626.pdf
    • https://torgradio.ru/new/files/file/denajidumuwiz.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc344b2998---41203604981.pdf
    • http://tfh-filter.hu/_user/file/lenuvepu.pdf
    • https://etcbt.com/userfiles/file/kajusarudadugiluxiwexu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=need+of+microprocessor
    • 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_off0000b93b.bin
b79c0f38423b4403c28c43ab4f9fd8224bcd349e1d2d594d226a69ddfea7f3df
pdf-font-stream PDF embedded font (sfnt) at offset 0xB93B 15980 bytes
font_01_sfnt_off0000e260.bin
cba5dc5fd780815209f95a444b28a371829e143103d28d5ca6193a8285cccdc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 10348 bytes
font_02_sfnt_off0000f9b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 16792 bytes