Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f7cf7b7268f3ca…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 04:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83c531a0cf461c957fa4a8fa4425304e SHA-1: 3a4ab072834747164c075801a0f1bec3b70554e3 SHA-256: 48f7cf7b7268f3ca38951f6f2d31348d950665e8fcf6925952ca910df5c7c940
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised or disposable domains. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://essaidafm.com/uploads/FCK_files/file/dogisagamijudokaz.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/ranokode.pdf
    • http://afghansolar.com/userfiles/file/45215728613.pdf
    • http://pune-india.info/userfiles/file/gimude.pdf
    • https://amd-export.com/site/upload/file/23563483293.pdf
    • http://iglozawiercie.pl/zdjecia/file/nosexa.pdf
    • http://crediramasrl.it/public/file/79729884148.pdf
    • http://resurrection-life.net/userfiles/files/88731718592.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b4fc789b7a2f9a306ea55d697bcf15cb/16716233995.pdf
    • http://astorandblack.net/emailer/userfiles/file/94750941648.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ff7e10bb3---8449999474.pdf
    • https://heritagecambodiatravel.com/userfiles/file/74316673227.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b1422265---36326488725.pdf
    • https://kurek-rowery.pl/user_pict/file/5867492131.pdf
    • http://xinghui.co/upload/ckimg/files/202108081812274697.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3930a45d657231635f2b111d93eeccaf/10336299858.pdf
    • https://alperbehang.nl/userfiles/file/97954062524.pdf
    • https://abzesolar.com/uploads/files/feledigox.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c94772c1471d51c5d44973b0d88dbc21/92566585760.pdf
    • https://prosaison.fr/userfiles/files/91327178987.pdf
    • http://controlsystemco.com/cache/fck_files/file/92180258723.pdf
    • https://drticket.ir/basefile/drtiketcom/files/24091759152.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/a1sdqrc2at00scv0vf58qav8l1/58571151802.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/73c030e5a1f0787750634cc85a68aceb/10762523052.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/telefosef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=endocrine+physiology+patricia+molina+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_off0000dcef.bin
a402ac8b1e1084301a7e2af9ecdd9a1015c6f2c80c1ae53f1e7d5f35a59a4edb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 11164 bytes
font_01_sfnt_off0000f697.bin
e026c199fe04e54281293239173b359910d378018f2ad1f71769bf2b694c07c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 18120 bytes
font_02_sfnt_off00012500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes