Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c61b86d3d570ba…

MALICIOUS

PDF

70.8 KB Created: 2021-10-04 09:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dced7f60e5e9e70449de4d5483ff023b SHA-1: 3df6ba8721ed5c99ea234f33f07d961b6da3f60e SHA-256: a4c61b86d3d570ba99ab7785b4fb194ce190639a845653dad26db44e014937c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous embedded URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.deep2001.com/images/library/File/nebiwag.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/57765995829.pdfIn PDF document text
    • https://bloomeng.com/uploads/18919969824.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613329ad4c70d---banivudeduniv.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2c054da579309ac36e50a9509bbfe9f4/zosonewixodirezu.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/zidosodot.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/84294201243.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f8109dd0da9e2929cb8c4b5fcc3f097f/defubomededurizaku.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/17907586705.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/78873386864.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/1377072850.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139717877417---maxabojefivobir.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/gariv.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/pekufixitop.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xafopufafipesexevo.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/dewoxafexajotag.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tixewilawuxososofuxabutuw.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/gatitamimesubawa.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/21306770490.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/04ee05dca4771bb6f896f26867687faa/temumik.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/mefunid.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vitaririnozazomuwexugo.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/99866769794.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20211001180716_1002481511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=simple+credit+reference+formPDF 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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 10524 bytes
SHA-256: 77725217f4836a2adc38fa4513c3cef71316c778da13b948224707d966824692
font_02_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 15932 bytes
SHA-256: dbf52576d17d6873ceaf5518d03d854ca4e93b08a11fe9a52684e5881368b45d

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