Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a45e29335174990…

MALICIOUS

PDF

86.6 KB Created: 2021-08-12 16:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d3faac01626a67b711431aa2fb4ef71 SHA-1: 88aff5b09a97d19b7e9374779c63917b09cb75c2 SHA-256: 9a45e29335174990bb77d0a5e6bd8be7650087867158c62c858597c78213b0f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The primary goal appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=what+are+the+different+manufacturing+processes
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c303b8a63---82086421574.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd9436fb---17124921063.pdf
    • http://mwflower.com/upimagesfile///koguxo.pdf
    • http://aite-materials.com/upfiles/file/kamufo.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/74279209798.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f3cc89a3e58f65537e956e6a37e3053d/87009461472.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d42b0719---rabive.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fekuban.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f36ce6804---mimobugivola.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd99850d15---35609551975.pdf
    • http://www.findvoters.com/userfiles/file/12191061527.pdf
    • https://all-stage-meditation.tw/uploads/files/60db6f3109002.pdf
    • https://maisonforville.be/documents/file/pewavanoz.pdf
    • https://wegofa.com/userfiles/file/25100909114.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2pa78b15egcsfrgtnivsa5v6g3/91416100241.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/58140800036.pdf
    • https://fallsplat.se/file/jusatozopase.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/wajegadibalokivojeli.pdf
    • http://amsaneeraus.fi/userfiles/files/57313134238.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/825262acb3e796a33ca4c087006f2465/11370024833.pdf
    • https://ludifrance.fr/userfiles/file/tukinerafasusefupotafel.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608894ed4c3c5---getavalubumerumiban.pdf
    • https://clubslotalmatriche.com/calcas/file/jipit.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_off0000f11b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 16792 bytes
font_01_sfnt_off00010932.bin
946903f5c85eaf52e5d1c7d7af2ff61f668728acbcdce3f909e63d4077bc856e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 11112 bytes
font_02_sfnt_off000122bf.bin
a9f6f948299b59bad274353c24fe7ec131a8a13a8644c67ff4f5660297ef9b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16060 bytes