Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec9327fcee25d59…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 18:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 164a51e24b8fc8bfab1fe49ab4806564 SHA-1: f1b06a38ae16b872f4ced7a0a560577222be5542 SHA-256: aec9327fcee25d59ba99a19aa3ced590c0bb3bb5546733818c94c75d40620e1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'utm_term' parameter in one URL indicates a potential phishing lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://noahmission.org/dataroom/file/67212319793.pdf In PDF document text
    • http://fonnepal.org/userfiles/file/dezokuparupegilelexa.pdfIn PDF document text
    • http://synhbio.com/upload/files/wozeguz.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/mukajabuvodatisisod.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7e7332ab29f1090ea56c00bae49b8d1f/japebikajirimuzogas.pdfIn PDF document text
    • http://foodchemsino.com/d/files/kobuwuzasenuwajimaruwa.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/53156048350.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/85800022236.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d853c7210b---57332094261.pdfIn PDF document text
    • https://izometal.net/mm/file/45294018831.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/vaxugadokaj.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_5614DD83356B6478.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/kolipulemase.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16137944c73d4a---sevigata.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/56160274536.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/14559632396.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/82709735877.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/86366355452.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/vevenopo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff6b93f7b---rakuxigozobadamuba.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/zurulamu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/22434916884.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc139f0c59---pepimolafipisude.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/safobosomufijidaziduk.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/99620287225.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/2347695015.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/18636613489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ms+office+cracked+version+downloadPDF 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_off0000bc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC42 10608 bytes
SHA-256: a2a952ecc3222c7d5a5ebc78cfcfb876a78ee6fb513d47bb4a7a6ce3d50d792f
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16996 bytes
SHA-256: 6124c0564a45725a6d0239547eae05bad00bc51387751d778ed44563c7712a50
font_02_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1