Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aacfc58a5cd0f11…

MALICIOUS

PDF

89.2 KB Created: 2021-07-26 00:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45bd519f6cee497e09d7d31a84f94bc4 SHA-1: 2e752fb622528332e09ce0d956b627f4d36c1c43 SHA-256: 7aacfc58a5cd0f11ab72a354e74b5caca572ba04a0643ced86adff5cbd3ab1f9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, likely to redirect users to malicious content. No scripts were extracted from this sample, but the presence of multiple suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://airshow-bg.com/file/81327888981.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d37e49bf93c---19417689913.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/rexipikafaxitozefisefa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ca7053f59---roxopokab.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/27591840071.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/kifajeluberorefam.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e78bddb4---majokitexefisigokatidijum.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/menexur.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67e90cb74---91547214376.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9d4emmka94o30om76e6ceh3oi2/87520619739.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609893cbb9374---67254923347.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zivevipuzejikagozo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4d16ef29---65248298177.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893043b845c---senamixitimuwez.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/91606617573.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ev91uvm1j6qbmej530a7f0luvg/bixozusudob.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/96849855227.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/14787512527.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/93ce90cd2b60a2b5d50ee722c937aea7/42762577988.pdfIn PDF document text
    • https://yuss.it/file/15674875347.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4c6b4bc7513444519a55f5da6536701e/30621756737.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d749cdc4ec---61118389449.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af49ba4b8---80158356673.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/29601ddc6c8e04adfb0b3eb3cfa35219/fewowamub.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210529/2105291834571147828h7m8ni19tg1.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/dolapewuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alan+watts+o+espirito+do+zen+pdfPDF 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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 19588 bytes
SHA-256: d15ccc62cb38805eaf619fc6f49620bdf5806487b963a1ba8224414c3d4d6a74
font_01_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 10616 bytes
SHA-256: 54e1f88f82c8ab74e255f0e592aa247bbc0937eaeaf3dd76368c9583f6fac0f9
font_02_sfnt_off00013d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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