Malicious PDF — malware analysis report

Static analysis result for SHA-256 323cb048d1dcb1bf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 21:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8417f490f75089d22f96b0f316cbbb20 SHA-1: 0abe85e5bd93fddff4ca352e2e2e6d4b22988559 SHA-256: 323cb048d1dcb1bf9da13b854b3b90e5ec73f30adf9d702a66294e058af60653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to direct users to malicious websites, likely for phishing or further malware delivery.

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 https://inwebjor.ru/uplcv?utm_term=how+to+do+video+call+on+computer
    • http://scout-educationguide.com/userfiles/file/50979625194.pdf
    • http://fasson.vip/images/editor/files/20298067878.pdf
    • http://christschoolblr.in/userfiles/file/nanut.pdf
    • https://vendax.ro/files/file/92766808358.pdf
    • http://szintai.hu/ckfinder/userfiles/files/62496068628.pdf
    • http://orderleesushi.com/uploads/files/92097221403.pdf
    • http://rem-proekt.com/f/file/faxokimebuzimibusugiw.pdf
    • http://baby-daycare.com/uploads/files/202109031357083761.pdf
    • https://servicepapik.ro/files/8750265775.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/88481585273.pdf
    • https://al-farh-iq.com/upload/userfiles/file/zumukusapuxo.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/53246592119.pdf
    • https://z87992961.com/upload/files/20210905013442.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/lubadasiledikapum.pdf
    • http://mixmarketing.vn/upload/fck/file/94474368379.pdf
    • http://gardenofsound.com/userfiles/files/96682732181.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9298270f50f63ea8919bc7abed51e667/jepomimelisogejerawe.pdf
    • https://balajihighfields.in/userfiles/file/83166867548.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c42f69b8fe2f7fb2c9121f4979af6f66/wamijupikiwuzetepiratas.pdf
    • http://kerrya.com/ckfinder/userfiles/files/sapawugolebavi.pdf
    • http://gevenschoenen.nl/ckfinder/userfiles/files/jovevasazipodelobu.pdf
    • http://toonesk.com/upload/32047143741.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e9f87190df0ad8ad01236817e409827c/gabotarevawofolaxoru.pdf
    • 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_off0000b12f.bin
ac0e855933a550d6970b80788c1d480b123cd5d11611a168545a7e9fd9d26041
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12F 15088 bytes
font_01_sfnt_off0000d762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 16792 bytes
font_02_sfnt_off0000ef79.bin
cbaea0754bf0fe7bf321c5bb47c40814f9d4838dd56f2f767dd9f21ed02fdb54
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10752 bytes