Malicious PDF — malware analysis report

Static analysis result for SHA-256 543d231a0f0be916…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb174aec8f57b15e5bbc4733281c0e3e SHA-1: b00b638d9f91dfd5e9f3c7ca1c8be894a05074cc SHA-256: 543d231a0f0be916373e1af35c0849cb13d168995a238feb18c1df436c8c19af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://pixomot.ru/uplcv?utm_term=changing+exposure+on+camera
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vb2mk83kdju9vbcr8t0pl645pm/85162850973.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9c40a0f9---78486888585.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/jigojubemurolos.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8ff5a742---23529838934.pdf
    • https://al-farh-iq.com/upload/userfiles/file/22241641083.pdf
    • https://abofahed.com/userfiles/file/97565931458.pdf
    • http://villalapinetafavignana.it/userfiles/files/jolazoredovilovimetup.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/5rfneev58gudrmfigcrm4ssals/34394324795.pdf
    • https://charterfori.ir/basefile/charterforiir/files/80681641973.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66f1b59dc---76829263035.pdf
    • http://samnakthodrahassob.com/userfiles/file/jowuvibona.pdf
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/nosojafuzidivatanemazoxa.pdf
    • https://autotrans911.com/thread/admin/uploads/file/15952193409.pdf
    • https://appvid.eus/userfiles/files/minutirol.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1cf654e95---61028794203.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/novoker.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/dubumavasupefowegerat.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf17033ad---91721772735.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f06371e55---63508127527.pdf
    • http://mid-europe-ex.com/11336813828.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160774c0f706fe---lovonelozejodarelalubi.pdf
    • http://www.bandungmesin.com/file/96319630506.pdf
    • https://hogies.com/includes/template/uploads/file/ropibavevagepuwekiji.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/58765349362469a2ee2f0feb05586968/repixifazeseje.pdf
    • https://palezieux.com/ckfinder/userfiles/files/jidule.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079474617de3---47673189431.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/fetavujenipusa.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://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_off0000f818.bin
e46928fdede4620765ab012664c8f176f57fe24afa8e025e8f9d4571b2e4ad55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 17124 bytes
font_01_sfnt_off0001250e.bin
595a9a544ce15f39dabd4bc300a53dab47bce93ca8fa3d67936e3a7701af98aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 10908 bytes
font_02_sfnt_off00013e29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E29 16792 bytes