Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4370e360d4e245…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 06:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96c24f79107565e22f3a52ea35a096d2 SHA-1: f0354e667bf6c384b34a5dfb39678d7733cae3b9 SHA-256: 2d4370e360d4e245195635085e2c5e2485317193e102c9ff0d55c880d5a20af0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to disposable hosting or potentially compromised CMS upload storage. The presence of a Google feedproxy URL with a 'restore data' keyword suggests a phishing lure, likely to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ambulanceservice.pl/userfiles/file/mapufekasamepirom.pdf
    • http://screen.by/images/file/51742827162.pdf
    • http://kraemer-duennebacke.de/files/file/55158094636.pdf
    • https://officialbacknumber.org/editor_up/94365312391.pdf
    • http://soupworld.de/upload/file/53965966079.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/30412252369.pdf
    • http://sziazsauto.com/uploads/files/28445571755.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c89773ef7---zatozixad.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327aece14cf---44476250634.pdf
    • http://thebankcardservices.com/uploads/files/ruwago.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252dc8930e---75943382993.pdf
    • https://leciv.fr/uploads/FCK_files/file/butisizutigarix.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mavaxosotu.pdf
    • https://clubon.top/uploads/files/kegigonuwek.pdf
    • http://newmob.it/userfiles/files/57946309256.pdf
    • http://boothbayharborshipyard.com/userfiles/file/mifeli.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613409a75a6ac---bawagevijubopako.pdf
    • http://dpsszczytno.pl/photo/file/92887515848.pdf
    • http://lamorenj.com/userfiles/files/malujitumo.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/13598819152.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/14570594718.pdf
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=restore+data+after+factory+reset+android+without+backup
    • http://irodori.kir.jp/files/file/25141905890.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_off0000c3b4.bin
78bb5970734b4a4dcfceb29d6ad9ffeb155637f9bd5a4cc1ea6776987a40fcf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 11248 bytes
font_01_sfnt_off0000ddea.bin
4d7c3735d013a3fcaf887596f076baf01388f41ed27d6890781d5615fd0e8eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 17568 bytes
font_02_sfnt_off00010b6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 16792 bytes

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