Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b673ddc1c97f31…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 23:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d64ecf80749c244bccb6aaedb629457c SHA-1: eb1bd0675556101fc46dd9b9fa78ddc9348ab8f9 SHA-256: 62b673ddc1c97f319bef4e0fbb9c499a604f276f659a56fdf070ba22eee56ce0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the nature of the heuristic firings indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d29f702f9---gegavitogupatubobus.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d408b748d---busesadumumupoli.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/aa6083edd29b7fa366c27f8b610fd231/86973547215.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/851eh6noouvhdf8rj09oko7s61/gupinazuguxopopa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738af53351---betusobibasaxejim.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/dinokukevilegawajosa.pdfIn PDF document text
    • https://hagepoorter.be/files/files/95072386120.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nudunefuv.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca058196640---vadeburojodadewono.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/38f51e1f68cf448774eff7cefafd9794/63083340122.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22c13df1e---6211705898.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9ik35v3qjdm1trdpgvg6vlj3m5/tapoded.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oi2gufe0a1loeovihjdcdpv2ho/wojajamofuwekujoxux.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076a15c7cf64---zixozodew.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5293a882---poxogux.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/pekadatesatajibumo.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/jn8rh4h42pidn4dknt5hj233p6/9343286256.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7268b5ea---suraturelowojogunutelizez.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/80709355097.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087660597055---gogatanipowumuxan.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee8fd4f91b---sasepora.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/loditumozenagu.pdfIn PDF document text
    • http://webursitet.org/Files/file/wenido.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7e01420a---47578659521.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1900756206edaa692988a2173809e870/10504591847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hapalopus+sp+colombia+largePDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 10748 bytes
SHA-256: afea6edf729e18e2ba9831294c9d61530a272012d56abe020ba3b3728c11af99
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 18596 bytes
SHA-256: 8ca01a31c79e880f527d3e7e6fa0b7bb5145b10681e1ccc5c63bebb088ccbdf2
font_02_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1