Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddcee4e3b5b206f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 02:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 93ac9a15ec2216505af4610c9c077929 SHA-1: 1d358cb99d460f605d2c31b01e7918613f496d15 SHA-256: bddcee4e3b5b206faa6605612ab7d03506ee8d96fbeb17c65e45b5ef799ca4aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple links on potentially disposable or compromised domains suggests an intent to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://irlanc.ru/uplcv?utm_term=android+links+not+opening+in+app PDF link annotation
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasoxoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161420fdd2643b---69488661641.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/rejofiwaxen.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/teneku.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/57306039945.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dilimuluses.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/tetunose.pdfIn PDF document text
    • http://mp-journal.com/media/file/55596636740.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/13896282157.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/12479618330.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/pukokosefevegilopajur.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/21457954144.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/woxugumasajuxifajufike.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/26880550346.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/68488138627.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/wavepomaxopedakudilan.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/646184217.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ad60q2tkohb1dglb6kvl1qsetq/80733915891.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210918075310.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff10b46da7---84736593994.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lbnrcnpv9hqng5dpltd625c1f1/53195956245.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/negijibafipifiko.pdfIn PDF document text
    • http://apart1day.ru/file/78780176386.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/79143907507.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9749686e9347d77aa8474cf1827a918a/xakewudajagefe.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/mopumotibekutoduziluxes.pdfIn PDF document text
    • 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 10640 bytes
SHA-256: 196091966f3154ad5d38b9d3c6ca6d3db2070c83496b66a9399f262b93206975
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16924 bytes
SHA-256: 03e833250c511a722a890a58c206f5c7f743025290acee0ff1beb2130cd822d1