Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b74bb2c49d995e8…

MALICIOUS

PDF

93.5 KB Created: 2021-08-27 18:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1379e59410fd2d06851ab5308f29fbd4 SHA-1: a62fd516784e5310d18cec446ca544d9524c3733 SHA-256: 7b74bb2c49d995e89041a1b0dfa14f389b8668443cfd403e7b6f0accc43f6145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allytemp.ru/uplcv?utm_term=trivia+questions+about+christmas+with+answers PDF link annotation
    • http://stellamaris.cz/userfiles/barip.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/devoxefoxu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/1555300400.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/gajexufasabovapezavi.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///rovowanes.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26f2290c6---73541324258.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3129b3f4d---sedopozosogalukurox.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/kisilegusugovevosokedepor.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd44e24b07023be378ff7abdc18a2566/tonukej.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4624f58b81---92001523938.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/99069306234.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/9074303553.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/92975011860.pdfIn PDF document text
    • https://biocoils.com/img/file/suwem.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/67708891571.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5c5536fe---79497207615.pdfIn PDF document text
    • https://kawanmto.com/contents/files/zinozogikodopifuza.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/17d486edb23ac648ca26421ee89e31ad/12608138775.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912dd3364c3---36905141393.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f8b6260f---43619051259.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/kexojizexulelivabukubepe.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/gudelovesux.pdfIn PDF document text
    • https://digireg.cn/upload/nezepazovuxivusexoruwefob.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1b458aac---81592745497.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80eb9183f1---nitejodilixuzox.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_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 18560 bytes
SHA-256: 0cd694705d5c5b4e4e52165c57ea724043641ccc867e5bc2d801500df9ad7cf8
font_01_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7E 10948 bytes
SHA-256: 439994e0899fe10bd9ef48e9709ac6ae908ddc2152684497ab53985364f4128a

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