Malicious PDF — malware analysis report

Static analysis result for SHA-256 8980cbbcafc7df35…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43295ae1492282b9eff19aa5050af93a SHA-1: f485a3627fed776f55cc8916f1fd7f2dd52ebe53 SHA-256: 8980cbbcafc7df35608418f505d5f456c284db3797a66aa12602a7b96f39afaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://theprofitnesstrainers.com/userfiles/file/torabejuwe.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3lq6vg3iri2r0o75ev6ghe1r1e/letabu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b5ac53926ced29be8b65a5881d530ba2/29842297931.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dixanelutixagofonig.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/zisewuruzavozavel.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/61132551646.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nb6v1fl3criqfdb27gd71f6qf6/7507163542.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/84662522331.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/73885394279.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/xutitamutagejewarixugaf.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/16589792019.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/71107135738.pdfIn PDF document text
    • https://businesslife.com/content/file/44107104499.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/22516984719.pdfIn PDF document text
    • http://sns.hu/_user/file/teloxonataguran.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b272d09a16---kutosewateweluni.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0a5f15430949ae0d76d85117fd7d7dab/33979461618.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/fawowutu.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/11012097507.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/so85gc6fs8savn6ngl68r63c3i/gulubojoralaki.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wegabowuw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085042150096---mawexanapine.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d71772c0---47154603440.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/14568120196.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/kosefagexir.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/70614940945.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/wewixejizinodokizewesod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fermentados+vegetales+pdfPDF 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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 10792 bytes
SHA-256: 99717bbf89d6d4058edf1c08ec246091d54e6a67b14e35350cbaa8751fb2bb34
font_02_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 18400 bytes
SHA-256: bbf4ec4eeed1bc17fa174cfd613762f6a7fb374743164f521fb31e9fe5260a0d

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