Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c82d60716bb3ba…

MALICIOUS

PDF

82.6 KB Created: 2021-10-07 04:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1dbccc9a9c470ac8ced85d01cf9f254c SHA-1: b203f6a7101f186040c7486ce8d45b8020611101 SHA-256: 81c82d60716bb3baeb395f99bbf89d6edc65d3698f7a6e895bfdb0c688f5d356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting an intent to redirect users to potentially malicious websites. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crysiq.ru/uplcv?utm_term=setting+up+facetime+on+iphone PDF link annotation
    • http://sevimticaret.net/userfiles/file/92698604601.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82336285997.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161494d05e3656---38627543275.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/fatitez.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/75798913874.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/tilemefefaxenaxewes.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/2420077581.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210916_07F3FA083BB83702.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/dudijafikutefuwuvajuwu.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/68937809427.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/63228881382.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/27114619793.pdfIn PDF document text
    • http://rsentco.com/upload/file/72997083488.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/85885862034.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/xovef.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b967b28425c2aa5e059133f819f4f1cb/33549509305.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613337145dcae---44433440016.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/norixon.pdfIn PDF document text
    • http://cartopack.be/Images/file/70030628478.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/85216867218.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/norosasitepanaseteso.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615641a921677---89384741255.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/dawozubefafepukij.pdfIn PDF document text
    • http://myphamasia.net/upload/files/58680342015.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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 19400 bytes
SHA-256: 37b1c72b5b6fef3d3cfb122865052a289eeada08854fc38334f0442ac767349b
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 10788 bytes
SHA-256: 5abec6202f2d9bf68095d42c0e3dee3ce41b810f0d4ad0d16bd6355178bf81f3