Malicious PDF — malware analysis report

Static analysis result for SHA-256 186697d0dd60c7c9…

MALICIOUS

PDF

92.5 KB Created: 2021-08-10 02:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe2f535194550b72fa7072dec9ade6b6 SHA-1: c1ec46f0f0aea7da7b09d9b4a6cca6631b025107 SHA-256: 186697d0dd60c7c96305cd55f282db42cf9a97ee93d54914a022f7372c7225aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a link farm suggests an attempt to lure users to external malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 http://kwong-cheong.com/userfiles/87424287109.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b229029c695---fawekogo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b474baea22a022bf1a64ecab959d7eec/mazamesijolamakawiwoxov.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/9278534959.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/69007431399.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/mapamojise.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0d3576ea1642f26d9a300f0e17a5a678/wuximaloborubuxalafu.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/94980226112.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9877587dfcf87a3b7ea65c33a95f4377/bojepisezupiketomunaku.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/xasepupixaxosewa.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e01523cec---53553654788.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd62eb66d7---resafuzodanumujivepo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611197bec32f1---48782148975.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed4bf16cb83d3565fe039faba8525d7a/jakasijumituwejed.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/jojavarogafuvan.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vv8o34i1uc3e6h030a0ddrljh1/perevej.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/51d8a07422af61ff92359750071e9c0f/45858329466.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc86b6240---laradaxixuwoxuwexopetogil.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/kivorulamijo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/26106184905.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/fifatadilagapaditujof.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b318f0c774c---80696477077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=%C3%B6l%C3%A7me+de%C4%9Ferlendirme+kpss+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+ve+cevaplar%C4%B1PDF link annotation
    • 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_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 21336 bytes
SHA-256: 4cd7ee9abe39efc860e702f577668cf4df6441cbeb0f46885aae951ce8f11f24
font_02_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 11680 bytes
SHA-256: 9d3841e40f86790290826d371ecf425c39360c0eda11d46ddc62f80e4c800fad

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