Malicious PDF — malware analysis report

Static analysis result for SHA-256 270672ef6db86a79…

MALICIOUS

PDF

82.7 KB Created: 2021-07-02 02:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c26c98c8618c4627069551a693253f75 SHA-1: 1d888ecea559c9428bf16c1e4eaa069ee315f3a8 SHA-256: 270672ef6db86a7949b88786ac269e4fad561a2d1c2622dc35f6d686597e152e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ajivikafinance.com/userfiles/file/54410969667.pdf
    • https://advantagelic.com/singhania/downloads/file/44214691571.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700bdd35f57---kigakidojejilidafigas.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d70cb4e4---50040715453.pdf
    • https://bestofbucerias.com/upload/file/sojedigitiw.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pabizigujavip.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/rojipulevonisudenavab.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/7476545489.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508012953188007.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b100a74d1e320133f860ccd0735ee071/7586901583.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1c5cd6ed---67799504254.pdf
    • http://beastyenergy.com/userfiles/file/vajedixugodewinumirosaki.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/norefifomefiniboxupa.pdf
    • http://absolutelyneon.com/userfiles/file/xodikekibov.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23c194de4---85370131183.pdf
    • http://www.thaiboat.net/image/upload/File/82848539814.pdf
    • http://bhttourist.com/upload/fckimagesfile/satobofetupagaxexirimed.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9a1e312c---vinakifodotevuwatari.pdf
    • http://broorybulldogs.com/clients/33993/File/bebopigeso.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/zasonebomibemi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf047eed195---51303292910.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c559a78e4890efe1346bda6c722e5745/12504094717.pdf
    • http://internationalnetworksolutions.net/files/53803709703.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc85c61ef---9150447205.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vdjg98jqf1758i1m5i964qrt01/29867295002.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/287f7a133c280b3de5b15dfa747c5bf6/57076836128.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809afda82a3---99713019373.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=molarity+of+silver+nitrate
    • 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_off0000e299.bin
f5f657efd410b8048291dfca33c1acb112098ff3088f57f54822e3de334dfb14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 16528 bytes
font_01_sfnt_off00010d9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16792 bytes
font_02_sfnt_off000125b5.bin
462cc9ba06f735fd7c7bb85caf7d07746999d4f175b1c39940efddfaeebf9176
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 10380 bytes