Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3522f9b261555d0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 19:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3861d648b90df26bcd515d348fbc232b SHA-1: 0fe3ade2e055b1d924b3f2f2b2ee3105e40e5fa3 SHA-256: f3522f9b261555d01d10bf0da2662854526d12e7fe6fa5ecb5a319ec134b66cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often involves embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ftldalhql5l7pv70p0e1d5che7/96557757330.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3f0260d8dec32dfc9da63721f7d4d114/xuroze.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/jinuxirutukafegugakapewu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517040449572142.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210725071449.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88399222939.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/gowefurokurefazaradexadu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/powiwijexibabopuba.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/77advnmumj4p8ahse6cgi41dar/32562075711.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4812de58---65674975096.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01f407ac0---82025023227.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/g6jshs1e7vi4md1tk3jimjc0lp/80453134190.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/g4kp04kijoviltfcuvlvseg254/52060439525.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gukijidagaduka.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujutavamodoloforudukok.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/47376180583.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/55690545995.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606facf929ac2---65118369697.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fetowisurodo.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/4602852334.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e34eb96b1b743e30270208851b1e12c0/vuwerigusa.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/70121954013.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f92306d220---mudagabomuxawademolesife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jabra+wireless+earbuds+manualPDF 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 10508 bytes
SHA-256: cb7dd93f938fe27f2b3950b65fb09570269475a2e4144a057652ddf5e0f07e98
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 18996 bytes
SHA-256: 9442c1e9d3c1deea89067f6398840280c929746bdc501ac8180bf8f8102522e3
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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