Malicious PDF — malware analysis report

Static analysis result for SHA-256 019228c800aaaeb5…

MALICIOUS

PDF

79.9 KB Created: 2021-06-26 12:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d500ff33b2a92a6bdc508ea39085a28 SHA-1: 941e86fa86b9c8aebdcc4fe872b376cf6e477ca9 SHA-256: 019228c800aaaeb5189c7e6b5ad27eb56a1a22451589f1f8430a1110fcef9ddd
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by both ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://shiokerbau1.com/contents//files/56534360243.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799dda46d23---55910719975.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b820dac3b8b---fegewefojenaxefewagamifu.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nuh57ubqvuv8vi0t40rmpfd5mv/86838243163.pdf
    • http://tfforming.ru/d/files/78877787554.pdf
    • http://netinflux.net/userfiles/file/82112296966.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160830f19c0fad---76281627777.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b0e3308816057939e6d560a4e82e40ef/xopimivaganil.pdf
    • http://hanboo.cn/Uploads/file/2021060715083470554.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/tepotitopibokagipobox.pdf
    • https://beaszemin.com/files/22200969084.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4mcvmsrfhcnvvb1943u2a091oe/33567831233.pdf
    • http://gesundimjob.at/images/content/files/gipires.pdf
    • http://brezov-gaj.si/uporabnik/file/fukudoto.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607636328a621---pamaton.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160766c30665e8---wivuwoxeri.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebab9e331---rupuf.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607021e652d38---tapotusigomibidu.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b19bfb41---88758436243.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732a1f0ae08---zagumejemunaludeveme.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8845b2d0ad---lijuregumodoluto.pdf
    • http://nsfeed.com/_UploadFile/Images/file/zaberarajubiwovuze.pdf
    • http://simonide.org/userfiles/file/50950486815.pdf
    • http://cafehinglung.com/uploads/files/nulilozapopasekagaravis.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3c749c441224dfe274bd4530c4739152/79446400734.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/i6s2gij352i1k898068teuucv8/57877459493.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0069b3cee4---66468878832.pdf
    • http://sva-jeanroze.com/xmedia/file/88756593632.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=32+oz+is+how+many+cups+of+water
    • 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_off0000d385.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16792 bytes
font_01_sfnt_off0000eb97.bin
fab7dde20fde5ae0b1e297f0c54da105b8a81752523b6f88615cf2fc47356228
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16788 bytes
font_02_sfnt_off0001176d.bin
a684d9775b034e16001e45e9c024c05f760d4d71ca2205974d796c24be47f358
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 11252 bytes