Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dddae5d7f3b0d6…

MALICIOUS

PDF

102.9 KB Created: 2021-07-06 16:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef711fbac53826218d00129b3ca2553e SHA-1: 6e2b0658087387f08fbb4a84ccb57539e5d772cf SHA-256: 09dddae5d7f3b0d615e88ac9c814be73b7db00e24aae3cae4eeea1d4f24469c9
164 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to compromised websites, many of which are hosted on disposable domains or use UTM parameters, suggesting a link farm for phishing or malware distribution. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading further payloads. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=yield+of+rubber+per+acre PDF link annotation
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0be1548835d3e0ca4fb50053048111e0/26899429959.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/zuwigutawusigobiwuduxoxi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609770f49fc79---pidojesawe.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/518154681.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc66dd8d60---biloxi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lj93n627k2ltbpcsm1gpaodg46/56232522329.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5e116d379cb2b01b7211ad54611f31d4/35918254048.pdfIn PDF document text
    • http://markone-tools.com/upload/files/vuwibewudow.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/33489418293.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2a1350ba---86289348605.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6m8v1ioeaihvs2ivp9fpfbdnu2/23104131375.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eafe972369---xubonirujobavaranikes.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88a710f00---wumoj.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/59566759253.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/b75nlsimtflj38tfvd8nj1ei5l/zopuko.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/mudalofowad.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/veguwuw.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5dabc3e8758468538c5b3fe23eb9d823/2456722779.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gutorupetibumirin.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0a0857390---90029152819.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf39244fea---vibin.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a467e8114f0---bawixuvirufazijomubefamub.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/mutavibegumibivoxusevinub.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/29718587731.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 10464 bytes
SHA-256: 10596568a2c5669e52b4919b659a659fa48316ab1c23d5eb405da09a8d595371
font_01_sfnt_off00012e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 18160 bytes
SHA-256: 6695d1ff73ae4b92096bed6bba28aacfd9e2dcedf2a5bfd7707feae022ee4534
font_02_sfnt_off00015ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA4 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00017484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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