Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab5aeeb048f2c27…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 06:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc6a039d5a401daafbb95da0eb67dee3 SHA-1: 1a46cecfa29f975ba4647df44fe6c9d92fc7948d SHA-256: bab5aeeb048f2c27f1f2165a60cd877ac0345b3efa368d97302f1f3e87cf1b53
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=windows+7+highly+compressed+100mb PDF link annotation
    • https://vinasimex.com/uploads/file/61032957253.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/81758588431.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vizajagorokasafu.pdfIn PDF document text
    • http://clingac.es/d/files/padekipobanesavujebop.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51833058537.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090214114915.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371155572cc---xelapaxije.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/vidopuperoziroku.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/nivutepunegutakubobejisad.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/zapalasovesoxapibotizesun.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/pizixagunovepa.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/tixev.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/93203118130.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/72488066750.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/15652409187.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630814671.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/85656427155.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xamal.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/vasote.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d42aa2d---xogejutedowiluvikepuv.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/8499580283.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/29325866754.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142101f23dce---torilusixeropepunaxeb.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/bidimuwowaxeka.pdfIn PDF document text
    • 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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 11260 bytes
SHA-256: e41e924fddf38e9dfcf75b60f1a4ee81e741aa579893757c2cfad935374829fb
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 17864 bytes
SHA-256: 3563fb1ec4cbde5988f63c163e3d3617771b6b7a7990087c8ff2735182882fb5

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