Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc35980aaaf030c9…

MALICIOUS

PDF

80.7 KB Created: 2021-08-16 11:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2aff6062f9d7b29a9455fb1a4da78b46 SHA-1: 10138606d33f565f00cb32fe3ccf7d7be4197b69 SHA-256: dc35980aaaf030c9dd8969b29a134ea8d827474ce41cc76076a532e0f99374dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to obscure malicious destinations. The presence of a PDF_RANDOM_URL_LINK heuristic firing and the ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URL 'https://inwebjor.ru/uplcv?utm_term=nutra+cleanse+clean+shot+instructions' is particularly suspicious due to its structure and UTM parameters, suggesting a tracking mechanism for a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=nutra+cleanse+clean+shot+instructions PDF link annotation
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/44460bd736a1ec9700e724ee2b7a6b10/wutexozeduz.pdfIn PDF document text
    • http://sb-78.ru/files/file/27360205948.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/74494080791.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/26607526103.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78d3cce6983d96785b99960a1fcaaaa4/56892297913.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/67492011455.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/remebuzuj.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/jadexevemedoxusumapagi.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7lari8nlhgnp4l918b2293lhhj/bexujiroluzufodam.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609107df19c83---niwifuro.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/loroxudelovivupizefeve.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e83b12527---38789535246.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/3046235322.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/545895327.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0911d27e15f277bd6484a35a1ff77478/xorazivajivuw.pdfIn PDF document text
    • http://normel.org/files/upload/file/24079340748.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08cef8ed90---jojokeradubomomalozujeti.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/99591893474.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l00rm3cbm3u2suscik7hcc3p6p/40717211198.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074b18891e40---1573623958.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/memixede.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16056 bytes
SHA-256: e7a7e82dc912068efbe2ea82fa527d3d1896556c39cb3445aab652508420ae7f
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10404 bytes
SHA-256: 4f1f693c7433f39a4809b83aff0d85b706cc1d9277e92e9d6e923481e9817d51

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