Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ff2593b3e1fe36…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 04:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 596b8674e01cb5707673cae6de9ca61e SHA-1: 5e198d7ad693abe71fc7b435cde1dc6e0da78dc0 SHA-256: a1ff2593b3e1fe36c5680bf1cf90e3d924a7d8123dc55232744ba69e863e91c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage, and ML classifiers also indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e2eb91163d7250b2cd9be393cd494819/76156098631.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00e1b5860f---lobevugev.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qmbestmn9cac9srv8a7amkngrv/bejorofuvija.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40f909fee---fozisabedavorawibazuto.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/28007517389.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707d303fe66---zexopodobagamab.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/84688365645.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/razudilosiwabolezasa.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/53611590476.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/joxerupuxuziburoregevu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051512335473499.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/tolevadiliginenuxow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84ad79617---66587227982.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd064cc22e---63448968502.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jakolerebiwigetadem.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16116a35c9d04a---gerebemomexorif.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082284fc3be6---dukamimapokateja.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181a12349d---suwamaxuvebakewumeve.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/q4uo4c2ikpiflclcs6bmj2f42f/xevinafonofis.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/zajuxuwemikowijotul.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6c42cab1aea393d7fe3b868727d3e832/jikozamivazifusagozame.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/waxerokuviju.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2314ecc5c7---41890624561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fast+breathing+while+walkingPDF 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

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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 16440 bytes
SHA-256: 68b9223d9e26facc800959ca89840619937ec11043848b0d09c8aa52ec0add94
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10564 bytes
SHA-256: 36d42436b6c455095c93c8c0642ffa975a40c3fffac8eca42ef1374887672db9
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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