Malicious PDF — malware analysis report

Static analysis result for SHA-256 faba0052e5b16c59…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 19:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 733458b8d8e1ff55544b150a05e29579 SHA-1: 8e7acc881c735f1c2a2a2cf1a2200a3c9faf9256 SHA-256: faba0052e5b16c598d11618b5d087e00d29148b6a9f4f98c3fc6a9ec444a1386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078072593531---lasufonalizuwaw.pdf
    • http://sevoir.hu/uploads/file/6534881856.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m8br1cuco67cuqteais4j35u8u/27194390352.pdf
    • https://auto826.com/uploads/files/redapesamorivexos.pdf
    • http://hani-bee.com/userfiles/files/kojurizolagadibazekadab.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739c48da8f1---nakafokazikuxogokusu.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/31ne6m4jae5hc6h082mq0l9hjg/rovumuluwaxej.pdf
    • http://mytmbc.org/fckimage/file/semejeneked.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f93297cf6---ranolamuto.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/77cbda3217812f32e8576a5048eee4ab/wepugesinifevinig.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c862df65ca4---79142390086.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fe1bb18ab1f6996cb5a4eacbe953be79/21035950858.pdf
    • https://medtek.vn/storage/file/zivafi.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/182ae3a2246fbc5a66fefc049d0714af/kaboravugenazapakomod.pdf
    • http://chizclean.ru/files/fck/file/26539068277.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c719dad7b7---6709521721.pdf
    • http://chayka-svg.ru/files/37525181375.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/xepolenoxokafasenoxefor.pdf
    • http://nakakinpump.kr/fckeditor/upload/file/zebikijo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef907aa5c---jukinovok.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d72f6919d075c46f325eea95a91555a/85955419570.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=a+little+anemic
    • 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_off0000f0f9.bin
ee63eb36d969f5cb51e82733801a5a2544f0b23af2710127278242ff45ca5ce7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16628 bytes
font_01_sfnt_off00011c42.bin
94e531df625389db390b4a55f367e6cc83cdfdae64e4bac9f6d3adb64f9ef7c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 9984 bytes
font_02_sfnt_off00013253.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 16792 bytes