Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bd476e2399244e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 20:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e36dda0b619d12912dd850babefd527c SHA-1: d316069c1bf7f6662c22e7fb97c0eef63fc4ac5d SHA-256: 64bd476e2399244e3110c42f0f735983486d3e57026148c39025232be4cbbc1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://dr-temt.ru/images/file/26673943052.pdf In PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/jusomes.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/10319663607.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/9319998675.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ruliwuregafododipuvawa.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/27421547591.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/fafipukipifepibivutenupe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/23la22aff3d0b16qeg84ahomi5/77214396571.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/42297895648.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/wanowodafekevafo.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/wajobexotubapori.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/82604607083.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b645edd9988de1af3dbd532ddfdc0774/nabopugevagogufe.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/17868782345.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/66624795355.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/zarowilusoxovuzuxofuwi.pdfIn PDF document text
    • http://ingore.cn/upload/files/dagapevifosomemusekaxomam.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e04b37214---demijuruxopabonaguw.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/zukotabufufitaz.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/74008193201.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/12903295426.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/22293853938.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/ravoj.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/sojawotokavabewowo.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/030953337569.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vosivizijos.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/72124957374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=easypaisa+app+download+old+versionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000befb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFB 16760 bytes
SHA-256: 412a55af1e4dd3c9262b3eaf235ade0c30273361c565d76ae27f639e526185be
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10536 bytes
SHA-256: ae05e16c23b018be2118e7fe7e2fa7112ae7ae586344fbf31711b7f0989d5634
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1