Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3fea3e504ac540…

MALICIOUS

PDF

94.4 KB Created: 2021-07-23 21:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 889a61bcbf995fd83f11573357362970 SHA-1: fcec17359a35f32c7639564597ffedd38ba8fe2b SHA-256: ab3fea3e504ac54090d41d4d8af72603fae5cddce2c824076ac61493f267f847
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. The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting it is designed to lead users to malicious content or phishing sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c426e9b01e---jedip.pdf
    • http://ttccid.com/userfiles/files/pabored.pdf
    • http://srhs1980.com/clients/877094/File/zofewaxezajinupemo.pdf
    • http://re-view.online/fckFiles/file/77860693325.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f032057fd7---kunovogod.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a73f94e0b---felorabesowovimez.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/mewijizimurusawijip.pdf
    • http://fobas.cz/userfiles/file/48528255134.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26fb25bf---33818911234.pdf
    • https://digireg.pl/upload/31995128661.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105291210333866.pdf
    • http://eaas-journal.org/survey/userfiles/files/37195226340.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6283d6fe9e415575d8bcac89d48fa2c1/3025996753.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/33773475951.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa8680cfa---nesirogazarep.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jvpdum71sqk93b9eqk27coo3ba/77910904370.pdf
    • https://xanbiente.de/userfiles/file/83519020220.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910f5d8ab5e---bafekategabavomegezir.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a614c5b51a8---gededakavolisiviga.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4afa8ce443c16e18dd6156937eed3ac9/vorugow.pdf
    • http://jjkxmy.com/upload/files/202106171505137196.pdf
    • http://abwplazaview.com/uploads/files/29558602527.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b321c44---tupajenak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=california+dmv+drivers+license+renewal+practice+test
    • 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_off00010c92.bin
949c5cec347bf28411c2cd193df4199e47fb82f3cfacb9381ac7aab30ce10b58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10964 bytes
font_01_sfnt_off0001260e.bin
687527fd4200d78b03823e1344b8e43de316acded1ffa167cff2b4fd7befb89d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 17076 bytes
font_02_sfnt_off000152b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152B1 16792 bytes